When does the maple fall its leaves?

Maple is a tall tree of the genus Acer in the Aceraceae family, with a height of 24 meters and a crown width of 16 meters. Many of them are world-famous ornamental trees. Maple leaves are gorgeous in color, chic and beautiful in shape, can make bookmarks, specimens, etc., turn fiery red in autumn and crimson when they fall to the ground. Let's take a look at when the maple leaves will fall.

When does the maple fall its leaves?

Maple leaves fall in autumn. When autumn comes, the day is shortened and the night is prolonged, the weather becomes cold, the soil temperature decreases, Rain Water decreases, the root water absorption capacity is greatly weakened, but the transpiration intensity is not weakened, and the lack of water causes defoliation. At the same time, after a certain period of physiological activities, a large number of intracellular metabolites, such as mineral accumulation, lead to the decline of physiological function and death (chlorophyll destruction).

Why do maple leaves turn red?

The redness of maple leaves is actually the result of maple trees' response to the pressure of nature. Red actually acts as a sunscreen, making the leaves stay on the tree longer and allowing the tree to absorb more nutrients. What makes the leaves red mainly depends on two substances, one is carotene, which is an orange-red pigment commonly found in chloroplasts, and the other is anthocyanin, which exists in the cell fluid in the vacuole. when the cell fluid is alkaline, anthocyanin is blue-purple, when the cell fluid is acidic, anthocyanin is red. After the beginning of autumn, the anthocyanins in maple leaves increase, and the drop in temperature makes the destruction of chlorophyll disappear, so the green leaves become red leaves.

What are the varieties of maple?

1. Acer truncatum: Acer truncatum, also known as Acer Pingji, deciduous trees, 8cm high. Bark gray-brown or dark brown, deeply longitudinally lobed. Branchlets glabrous, current year branches green, perennial branches grayish brown, with rounded lenticels. Leaves papery, 5-10 cm long and 8-12 cm wide. Flowers yellowish green, polygamous, male and bisexual, often in glabrous corymbose inflorescences. Samara is light green when tender and yellowish or light brown when ripe. Nutlets compressed, 1.3 × 1.8 cm long and 1 × 1.2 cm wide. Flowering in April and fruiting in August.

2. Chicken claw maple: chicken claw maple, also known as chicken claw maple, green maple, etc., small deciduous trees, dark gray bark, thin branchlets. Leaves papery, round in appearance, 7-10 cm in diam., base cordate or nearly heart-shaped sparsely truncate. Flowers purple, polygamous, male and bisexual, born in glabrous corymbose, total pedicel 2-3 cm long. Samara is purplish red when tender and brownish yellow when ripe. Nutlets globose, 7 mm in diam., veins conspicuous. Flowering in May, fruiting in September.

3. Tea-striped Acer: tea-striped Acer, also known as North China Tea-striped Acer, deciduous shrubs or small trees, 5cm high. Bark rough, longitudinally lobed, gray, sparse dark gray or grayish brown. Leaves papery, base rounded, truncate or slightly nearly heart-shaped, leaf blade oblong-ovate or oblong-elliptic, 6-10 cm long and 4-6 cm wide. Flowers polygamous, androgynous and bisexual. Fruit yellowish green or yellowish brown, nutlets villous when young, veins conspicuous, 8 mm long and 5 mm wide. Flowering in May and fruiting in October.

4. Blood skin Acer: blood skin Acer is a deciduous tree with a height of 10 to 20 meters. Bark ochre-brown, often ovate, papery flakes deciduous. Compound leaves 3-foliolate, papery, ovate, elliptic or oblong-elliptic, 5-8 cm long and 3-5 cm wide, apex obtuse, margin 2-3 obtusely large serrate, terminal leaflet base cuneate or broadly cuneate, petiolule 5-8 mm, lateral leaflet base oblique. Cymes villous, often only 3-flowered, total pedicel 6-8 mm long, flowers yellowish, polygamous, male and bisexual. Nutlets yellowish brown, raised, subovoid or globose. The flowering period is April and the fruiting period is September.