The aspen tree is common in temperate climate. This species must be distinguished from poplar, its closest relative. With a slight blow of wind, its crown begins to move, which is why this plant is also called the “trembling poplar.” However, it is valued not only for its decorative qualities. Various parts of the tree are used for construction purposes and medicine, and the shoots are used as animal feed.
Description of the species
The aspen tree grows up to 15-20 m in height, some representatives can reach 30 m. This species has a straight columnar trunk up to 1 m in diameter and gray smooth bark with an olive tint. On average, aspen trees have a lifespan of 80 to 100 years, but some long-lived trees can grow to 150 years or more.
Aspen has several characteristic features:
- the bark remains smooth even in mature trees, sometimes shallow longitudinal cracks appear;
- rounded leaves that are light green at the beginning of the season, then darken, turn yellow and fall off;
- flat, but powerful and wide root system;
- The flowering period occurs at the end of July or beginning of May.
The leaves are round in shape and located on long, flat stalks.
In the photo, the aspen tree can be confused with poplar. To distinguish between these two varieties, it is enough to compare their leaves. They are round and jagged along the perimeter, and their width exceeds their length. Their peculiarity is that they are attached to flat cuttings. Thanks to this shape, they bend well, and at the slightest breath of wind the crown begins to move. The front side of the plate is shiny, the back is matte.
When describing an aspen tree, the shape and color of the flowers also matters. They are bisexual and form inflorescences - catkins. Female flowers bright burgundy, men's - light green. In autumn, seed pods form on them, which are then carried by the wind.
What is the value of wood?
Aspen is grown in industrial scale or use parts of wild trees. The bark is prepared for the winter and eaten to tonify the body and strengthen the immune system. Branches are added to sauerkraut to increase shelf life. Previously, flour was prepared from this plant, which was used in baking bread. Nowadays this tree is valued for its quality wood, and also continues to be used in folk medicine.
The sex of a tree can be determined by the color of the inflorescences.
In medicine
Different parts of the aspen tree are a source of organic acids, vitamins, carbohydrates and other useful substances. Decoctions and infusions are prepared from its leaves and bark; shoots are used to prepare tinctures and ointments. The products can also be added to restorative baths. Depending on the method of application, aspen allows you to get rid of a number of problems:
- decoctions - for wet cough and excessive sweating;
- leaves - against hemorrhoids, seasonal diseases upper respiratory tract;
- bark in the form of tinctures - for arthritis, cough, inflammatory diseases of the urinary tract, as well as to stimulate immune defense and improve appetite;
- annual shoots - for bleeding;
- baths have a general strengthening effect and normalize the functioning of the nervous system.
Medicines based on aspen can be purchased at the pharmacy.
Aspen is popular exclusively in folk medicine. Such products have a milder effect than pharmaceutical drugs, but before using them you should consult your doctor.
For cultivating the soil
Aspen improves the properties of the soil on which it grows. IN autumn period You can observe abundant leaf fall, and trees also shed small branches. Over the winter, this material undergoes a series of chemical transformations and becomes a useful fertilizer. In addition, the root system has its own characteristics. The roots are shallow, but spread over a considerable distance. In the soil in which the aspen grew, multi-level passages remain, which are used by more demanding crops. Cultivation of this species is practiced to improve clayey and insufficient fertile soils with low moisture conductivity.
Aspen has a powerful root system and often crowds out other plants.
Aspen wood in construction
Aspen is also processed into boards. For construction purposes, mature trees that have reached the age of 40-45 years are suitable. The wood is light and has virtually no pattern. It has several features:
- highly resistant to high humidity air and precipitation;
- soft but uniform structure;
- long service life - it does not crack over time;
- low cost.
Aspen wood is an unstable species and is therefore not suitable for residential construction. However, it is popular in the manufacture of wells, baths and other buildings, as well as in the production of matches.
In landscape design
It is important to understand where the aspen tree grows in order to use it in landscape design. It prefers well-lit areas and crowds out other plant varieties. 
Representatives of this species grow quickly, forming up to 3 m of young growth in the first years. They are not afraid of heat and frost, and quickly recover after winter. However, they have one problem - the center of the trunk often rots. 
With age, trees become loose and fragile, so when growing them under cultural conditions, it is important to check their condition annually.
Aspen
Name: Common aspen.
Other names: Poplar trembling.
Latin name: Populus tremula L.
Family: Willows (Salicaceae)
Kinds: Aspen is a type of poplar with characteristic round, stiff leaves that sway with the slightest breeze. This feature of the tree is associated with the structure of the cuttings of its leaves, flattened and thin in the middle. Aspen is easily recognized by its light gray bark and reddish tint to the wood on the cut.
Lifespan: Photophilous, lives up to 150 years.
Plant type: Large deciduous tree.
Trunk (stem): The crown is rounded, broadly conical.
Height: Up to 35 meters high.
Leaves: The leaves are round, grayish-green, with jagged edges. The petioles are strongly flattened laterally, causing the leaves to sway even in light winds.
Flowers, inflorescences: Flower earrings drooping, cylindrical.
Flowering time: Blooms in April, before the leaves bloom.
Fruit: The fruit is a capsule, seeds with a fluffy tuft.
Ripening time: Ripens in June.
Collection time: Branches and bark are harvested in early spring during the period of sap flow, buds - before blooming, leaves - in May-June.
Features of collection, drying and storage: Every 30 cm, circular cuts are made, which are connected longitudinally, after which the bark is easily removed. The bark is dried under a canopy or in a ventilated area. Aspen buds are collected at the beginning of the trees' flowering, breaking them off from the branches. The collected buds are dried in the shade in a draft or in a warm, ventilated room, spread in a thin (1-2 cm) layer on cloth or paper and stirring occasionally. Young, fully developed leaves are used fresh or dried.
Spreading: In Russia, common aspen is found throughout the entire territory (except for the Kuril Islands); in Ukraine – throughout the entire territory.
Habitats: Grows along the banks of reservoirs, in forests, along forest edges, on dry sands and clearings, in ravines, swamps and in the mountains.
Interesting Facts: Thanks to its light wood, this tree was widely used by people for making household items (skis, wheel rims, arches, runners, matches, etc.). Currently, aspen is used for finishing saunas, since its wood is resistant to rotting and does not emit resin. From flexible shoots of young shoots, plants weave baskets and furniture.
The ancient Russian village of Khokhloma became famous throughout the world for its skilled craftsmen who made painted wooden jugs, dishes, cups, spoons, and toys. Many of these products are made from aspen! It cuts well with a knife and chops well with an axe.
Young shoots are the main food for moose, hares, deer, and beavers. The animals know about healing properties tree bark and carefully gnaw it in winter or eat rough young twigs, which is also useful for our pets. Thrifty owners have long collected aspen buds for poultry feed and knit brooms from its branches for goats, sheep and rabbits.
Signs, proverbs, legends: According to ancient beliefs, an aspen stake was the main weapon against evil spirits. When starting to build a hut, the peasants drove aspen pegs into the corners of the foundation. If a child suffered from insomnia, he was placed in an aspen cradle. When an epidemic was approaching the village dangerous disease, felled aspen trees were woven into the ground.
Medicinal parts: Medicinal raw materials are bark, leaves, young shoots and buds.
Useful content: The bark contains carbohydrates, aromatic acids, tannins, and higher fatty acids. Carbohydrates, aromatic acids, and tannins are found in the kidneys. The leaves contain carbohydrates, organic acids, carotene, vitamin C, flavonoids, phenol glycosides, anthocyanins and tannins.
Actions: Aspen preparations have diaphoretic, antipyretic, anti-inflammatory, analgesic, emollient, astringent and diuretic properties.
Infusion or decoction of kidneys prescribed orally for polyarthritis, gout, rheumatism, hemorrhoids, acute and chronic inflammation of the bladder, urinary incontinence and painful urination (especially during pregnancy and after surgery), in case of prostate enlargement and as an antipyretic for fever.
Dosage forms:
Kidney infusion . 2 teaspoons of crushed buds in 2 cups of boiling water, leave for 15 minutes, strain. Drink the infusion throughout the day.
Decoction of buds or bark . 45 grams of buds or bark per 500 ml of water, boil until the liquid has evaporated by half, strain, add honey or sugar to taste. Take ¼ cup 3 times a day.
Bud tincture . 1 part buds to 10 parts 40% alcohol. Take 20-30 drops 3 times a day.
Ointment . 1 part raw material in powder form to 4 parts cow butter or petroleum jelly. Apply to sore spots.
External tincture of buds . 1 part buds to 5 parts 40% alcohol. Apply to sore spots.
Compress . Wrap 2-3 tablespoons of crushed leaves in gauze and immerse in boiling water. Apply the compress to sore spots.
Medicinal recipes:
Kidney infusion
. 2 teaspoons of crushed buds per 2 cups of boiling water, leave for 15 minutes, strain. Drink the infusion throughout the day.
Haemorrhoids .
Aspen leaves Apply to hemorrhoidal cones and keep for about 2 hours if this does not cause concern. Then the leaves are removed and washed. After 1-2 days the procedure can be repeated.
Bark decoction . 1 tablespoon of raw material per 1 glass of water, boil for 20 minutes, leave for 2 hours, strain. Take 1/3 cup 3 times a day after meals and in the form of baths.
Get well!
Trembling aspen or poplar- Populus tremula L. - a tree from the willow family (Salicaceae) 15-20 m high. good conditions aspen reaches larger sizes. For example, in the Bryansk region, a noticeable area is occupied by 50-year-old aspen forests with trees 25 m high. And in the Tver region, among the impenetrable sphagnum swamps, there are mounds (remnants of moraine), on which exclusively large aspens grow: height 35 m, trunks with a diameter of up to 80 cm, and is only about 75 years old. The bark of the trunks is predominantly gray, but there are aspen trees with greenish bark, and in Eastern Siberia and Mongolia - almost white-barked, from afar they can be mistaken for birch trees. The bark is smooth, only in old trees with longitudinal cracks.
The leaves are alternate, rounded-rhombic or rounded, 3-7 cm long and wide, glabrous, green above, bluish below, with uneven large rounded teeth along the edge. In autumn the leaves turn yellow and purple. To his scientific name- “trembling poplar” aspen owes its leaves (they have long petioles). Look closely at the aspen. Even when there seems to be no wind, its leaves constantly tremble. Hence the saying: “Trembles like an aspen leaf.” The mobility of the leaves is carried out due to flattened petioles, thinner in the middle than at the edges. On coppice shoots, the leaves are usually larger and of a different shape - triangular-ovate with a pointed tip.
Aspen flowers are small, dioecious, collected in inflorescences-catkins from 4 to 15 cm long. All species included in the willow family are dioecious plants, that is, on some individuals only male flowers develop, on others only female ones. Both flowers are arranged very simply, even primitively. They have no perianth at all. Male flowers consist of 5-8 stamens with red anthers, while female flowers consist of only a pistil with an upper ovary and two purple stigmas. Aspen blooms before the leaves bloom, in April.
The fruits ripen a month after flowering and open in the first hot days: late May - early June. The fruits are 2-leaf capsules with numerous small seeds, equipped with fluffy wings in the form of a tuft of hairs. 1,000 aspen seeds weigh only tenths of a gram. They fly very far because, due to their lightness, they hang in the air for a long time and are carried by the wind over a considerable distance. This is how aspen conquers new territories. Its fruiting is abundant and annual. Experts have calculated that up to 500 million aspen seeds ripen per 1 hectare of aspen forest in good years.
The seed begins to germinate a few hours after it lands on moist soil - the seed coat bursts, revealing two tiny cotyledons. A day later a root appears. By autumn, the seedling has a stem the size of a pencil and a tap root up to 30 cm long. Aspen grows very quickly, especially in its youth. At 20 years old, trees are 10 meters high, and by 40 years old they reach their maximum height. Aspen does not live long - 80-90 years, but some trees live up to 140-150 years.
In the first years of life, aspen has a pronounced taproot. However, it soon stops growing, but the lateral roots grow very vigorously. They lie very shallowly, in the upper soil horizon, extend far away from the mother plant and produce abundant root shoots. The shoots grow very quickly - in the first year they reach half a meter in height. It is through shoots that aspen largely renews itself and spreads, although its seed reproduction is pronounced. Many aspen forests are composed of trees of exclusively coppice origin.
Aspen distribution
Aspen range - temperate zone Eurasia and mountains North Africa. A significant part of the range is in our country. In Russia, aspen is distributed almost everywhere. In the north it reaches the border of the forest with the tundra, in the south it reaches the dry steppes. In the forest-steppe it forms island groves, the so-called “aspen groves”. In saline areas it takes on a bush-like form. In the Alps it rises to mountains up to 2,000 m above sea level. Almost everywhere, aspen forms, as a rule, pure forests, with only a small admixture of other species in the upper layer. It is very light-loving, so where other species shade the aspen, it dies. Aspen itself often acts as an admixture in birch forests or in cleared areas of other forests.
Aspen forests most often appear on the site of oak and spruce forests destroyed by humans or destroyed by fire. Such aspen trees live relatively short - 80-100 years. They are light, which allows undergrowth of native species (oak, spruce, etc.) to grow successfully under their canopy, even if it is not shade-tolerant. Over time, the native tree species grown under the aspen canopy overtake the aspen in growth, shade it, and it dies, giving way to its stronger competitors. Thus, aspen performs an important biological role- keeping forest area, it contributes to the restoration of oak forests and spruce forests.
Aspen can also act as a pioneer tree species. For example, abandoned arable lands in the Non-Black Earth zone of Russia quickly become overgrown with forest and turn into dense aspen or birch forests (in some places aspen-birch forests are formed). But they will not last long - under their canopy, an environment is again created for the settlement of indigenous, more durable species: spruce, oak, linden, etc.
Economic use of aspen
Aspen wood soft, light, but fragile. It is used for various crafts, such as wooden shovels, spoons, ladles and other chiseled and carved utensils. Plywood is made from it, as well as wood chips (shingles) used to cover roofs. In sparsely forested areas, aspen trunks are used as construction material for the construction of residential buildings, sheds, and other utility rooms. Unfortunately, aspen wood is easily attacked by fungi that cause rotting of the core of the trunks, so choosing a good building material in an aspen forest can be difficult.
But aspen wood found its main use in match production. It is from this that matches are made, without which it is impossible to imagine our lives. How did aspen conquer the matchmakers? Of course, not with trembling leaves. The main advantage of its wood is the absence of resins and tannins that give off a smell when burned. In addition, it is light and burns well when dry, without soot. For the manufacture of so-called match straws, it is also important that aspen wood easily splits in the desired direction.
In sparsely forested areas, aspen is largely used for firewood, but its calorific value is quite low.
Aspen bark, despite its bitter taste, serves as food for wild game animals. Moose gnaw bark from growing trees, and hares clear it from fallen or cut aspen trunks. Bees collect pollen from aspen trees, as well as resinous bud secretions, which are then converted into propolis. 
Medicinal value of aspen and methods of medicinal use
Aspen has not found application in scientific medicine. People use it quite widely for medicinal purposes. Buds, leaves, and bark are used for medicine. Aspen in paganism had a good meaning as a tree filled with an abundance of life; its leaves always tremble, sway, and talk to each other. That is why this tree was considered especially saving against all evil spirits. By folk beliefs, vampires can only be killed by piercing them with an aspen stake.
According to traditional healers, aspen preparations have anti-inflammatory, analgesic and diuretic effects.
Aspen bark and buds contain tannins, bitter glycosides, benzoic acid and other substances. Alcoholic extract of aspen buds has a bactericidal effect on some dangerous microbes (Staphylococcus aureus, Pseudomonas aeruginosa, enteric typhus bacteria). It is better to harvest buds from young trees in the spring - in April-May.
Aspen buds infused in vodka or 70% alcohol in a ratio of 1:10 for a week. Take 25-30 drops in water 3 times a day. This tincture is used for acute chronic cystitis and weakness Bladder, for gout and rheumatism.
A decoction of the young, greenish bark is good for inflammation of the bladder and kidneys: pour 1 tablespoon of crushed bark into 1 glass of water, boil over low heat for 15 minutes. Take 2 tablespoons 3-4 times a day before meals.
Take a pinch (1 heaped tablespoon) of aspen buds or bark per 500 ml of boiling water. Boil for 15 minutes. Infuse, wrapped, for 3 hours. Take 1 cup 3 times a day for coughs and colds as a diuretic and diaphoretic, sweetened with honey. In addition, it is a good appetizer.
Boil one tablespoon of dry crushed aspen bark for 30 minutes. over low heat in 2 glasses of water. Infuse, wrapped, for 3 hours. Take 1/5-1/4 cup Zraz a day before meals in the early stages of diabetes. Drink for up to 3 months or more. A decoction of aspen bark also helps with gastritis.
Ash aspen wood mix with Vaseline in half or in a ratio of 1:4. Use the resulting ointment to treat areas affected by eczema.
Place crushed young aspen leaves, scalded with boiling water, on hemorrhoidal cones and leave for 2 hours. If these poultices bother the patient, remove the leaves and repeat the procedure after 1-2 days.
ethnoscience different countries recommends for patients with prostate hypertrophy alcohol tincture aspen bark: 5 tablespoons of crushed bark per 0.5 liter of vodka, leave for 2 weeks. The bark is removed in early spring, young, greenish, from thin branches. The tincture is taken one dessert spoon once a day shortly before meals. Instead of bark, you can infuse the buds in the same way and take 20-40 drops 3 times a day.
Kidney ointment is an excellent remedy for treating cracks in the chest and nipples: mix 1 part kidneys and 2 parts pork fat, grind and cook over low heat until completely dehydrated, strain. The same ointment can also be used to treat hemorrhoidal cones.
Dried and powdered aspen buds mixed with fresh butter, serve as an anti-inflammatory and wound healing agent for burns, chronic ulcers and are used to soften hemorrhoids.
The ancient herbalists gave good advice: when inflammatory processes Use a decoction of aspen, oak, and alder bark in your mouth.
Evaporate alder and aspen barks and scrapes with water, strain them in steaming water, and then steam them with molasses, and hold that water in your mouth, but do not let it into the larynx at all - and that glen (mucus) will disappear.
IN Explanatory dictionary We find V.I. Dahl: fever and teeth are spoken to aspen. Having cut out a triangle from the bark (in the name of the Father and the Son and the Holy Spirit), rub the gums with it until it bleeds and put it back in its place.
People know one original simple method of external use of aspen juice with table salt for toothache. They take a fresh aspen log, drill through the middle (but not all the way), pour salt into the hole and plug it. They throw the log into the fire and, without allowing it to burn to the end, pour salt, already soaked in juice, out of the hole. This salt is placed on a sore tooth or diluted with water in a ratio of 1:10 for rinsing the mouth.
You can prepare a vitamin decoction from aspen leaves: pour 1 part of the crushed leaves with 4 parts of boiling water, boil for 10-15 minutes, cool and strain. Acidify with vinegar and take 1 tablespoon 3-4 times a day. Autumn leaves give a decoction containing 1.5 times less vitamin C than spring and even summer ones. Remember this! For the winter, you can also prepare vitamin syrup from aspen leaves.
In Russian villages, peasants noted: If your legs are cramping, placing an aspen log on your legs helps, and for headaches, placing it under your head.
Housekeeping advice: To prevent the cabbage from over-acidifying, put an aspen log in it.
According to Sedir, it is ruled by Saturn, and is healing for Capricorn and Aquarius.
You will need
- - saw;
- - sandpaper with coarse and fine grain;
- - magnifying glass;
- - pure water and boiling water;
- - cutter, button.
Instructions
Determine by location. This hardwood very common in forests and forest-steppes of the middle, it quickly populates fires and clearings. Aspens are especially common in wetlands and other damp places, like other representatives of the willow family.
To know aspen in nature it is possible according to the characteristic external signs:
its bark is light gray, with a characteristic openwork of lentils - large tubercles on the trunk;
the buds are small, which distinguishes aspen from a relative of the poplar. The trees form rounded small inflorescences, similar to willow catkins. The flowers are dioecious: male flowers are reddish, and male flowers are greenish;
diamond-shaped carved leaves are planted on long petioles, the top of which is slightly flattened;
aspen fruits - with puff in a small box.
You can evaluate the rhizomes of uprooted aspen. Their curly grain (that is, with a random arrangement of fibers) is distinguished by a pearlescent luster, therefore it is used for decorative crafts. By the way, the same material is mined around large aspen knots.
Breathe in the smell of freshly cut wood. Aspen should smell pleasant, but not as pungent and tart as conifers. When rotting, it emits a characteristic vanilla smell.
Prepare several sections of log to determine tree species. Typically, craftsmen clean the bark and make an end cut across the fibers and two longitudinal cuts - radial (through the core) and tangential (parallel to the core). The cut ridge must have White color, with a bluish-grayish or greenish tint.
Treat the aspen blanks with sandpaper (coarse and fine-grained) and examine them. To do this, use a magnifying glass and lightly moisten the wood. clean water so that the growth rings are more clearly defined. The cut should be uniform in structure (the core of the trunk and younger wood are almost the same in color). The wood fibers of the aspen trunk are in even and dense layers.
Test unseasoned aspen wood at work - it should be easy to cut and process on a lathe. Using a mild cutter, you can tear out individual fibers on a cross section of the massif. Straight-grained wood produces thin, long shavings, like straws.
Make shallow punctures with a button - its marks should be almost invisible on. By the way, it is precisely because of the softness of aspen and its ability to interlock fibers that this material is so popular among manufacturers of drawing boards.
You can test aspen wood for the effects of water. If you steam aspen bars in boiling water, they will become very pliable and flexible - they cut like clockwork and bend. Under the influence of water, the solid wood swells, but is perfectly preserved and almost does not change its natural color (it is no coincidence that wells have always been made of aspen, and today this material is used for finishing baths).
Almost every person knows what aspen looks like. Its round leaves are easy to recognize among all the variety of trees. The tree grows in almost every yard. For centuries, healers have used medicinal purposes parts of aspen, and craftsmen highly valued the qualities of wood. Interestingly, there are many signs and superstitions associated with aspen.
Almost every person knows what aspen looks like.
What does aspen look like?
Common aspen (Populus tremula) belongs to the willow family of the Poplar genus. People often call it the whispering tree, the shaking tree. An adult plant can reach 35 m in height and 1 m in diameter. Young trees have smooth light green bark. In those that are older, it is dark gray and has numerous cracks and internodes. Thanks to this feature, aspen is easy to recognize among other trees after the autumn leaves fall.
The root is very powerful, going deep into the ground, with big amount offspring. Thanks to such a root system, it is aspen forests that most often form in places after forest fires. After all, even if the trunk was burnt, the roots remained alive and young shoots very soon appeared from them. And since the tree belongs to the fast-growing category, restoration occurs in just a few years.
The aspen tree is decorated with its unusual foliage. The tree's ovoid crown consists of many round, heart-shaped leaves with a serrated edge that look like coins. Each leaf “sits” on a long petiole, flattened at the top. This structural feature explains the fact that all aspen leaves begin to move at the slightest breath of wind. On an adult tree, foliage appears 3 weeks after flowering. At the beginning of autumn it acquires bright warm colors- from yellow-lemon to purple-red and crimson. It is the aspen with its fluttering multi-colored crown that becomes the main decoration of the forests before the leaves fall.
How is ant tree bark used?
Common aspen (Populus tremula) belongs to the willow family of the genus Poplar The tree's buds are large and ovoid. In the spring, fragrant earrings with small, inconspicuous flowers from 5 to 15 cm long bloom from them. Aspen blooms in April-May, while the branches are still bare. Since this plant is bisexual, the colors of the earrings are different. In males, it takes on a pink, reddish tint, and in females, from white to pale green. A month after the start of flowering, numerous small seeds are formed, which are carried by the wind over long distances. They germinate quickly, which explains such a wide distribution of aspen.
In addition to Russia, it forms deciduous forests in Kazakhstan, Korea, China, Mongolia, as well as in Western Europe.
Gallery: aspen (25 photos)
Healing properties of aspen (video)
It is believed that the name aspen itself comes from the word “blue”. Our ancestors also noticed that the place where a tree was cut turns blue. In ancient times this was given magical meaning. However, modern scientists have found that this chemical reaction on the interaction of tannins contained in wood with the metal of an ax or saw. The interesting texture of wood is highly valued by craftsmen, who use wood as a material to create objects for various purposes.
The Latin name of aspen – Populus tremula – is translated into Russian as “trembling man”. This is what they say about a frozen or frightened person - he trembles like an aspen leaf. There is a widespread belief that the property of a tree to flutter its leaves even in calm weather is due to the fact that the traitor of Jesus Christ, Judas Iscariot, once hanged himself on it. And, according to superstition, with every memory of this terrible event, the aspen tree begins to tremble in fear.
City Gravilate Root
However, as scientists have found out, this tree never grew in Palestine: neither in biblical times, nor in our days.
Experts explain the property of leaves to flutter simply. It's all about the structure of the leaf. Anyone who has looked closely at what an aspen tree looks like has noticed that its leaves are relatively wide and dense to the touch, while the petioles are very long and flexible. That's why they can't keep their leaves straight. This simple fact and explains the sensitivity of aspen to any air movement.
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