The effects and functions of yew trees generally take about 10 years to become medicinal in the south, and more than 20 years for Northeast yew trees in the north. ?

The dynamic growth situation of yew seedlings is as follows: the plant height and stem diameter of the seedlings grow slowly in the first two years of emergence. The plant height generally grows about 10cm per year, and the growth accelerates one year after transplanting. The annual growth can reach 20-30cm in 3-5 years.

The efficacy and functions of the yew tree are as follows:

1. Purify the air. Yew can not only absorb harmful gases such as formaldehyde, benzene, and second-hand smoke, but also absorb carbon dioxide and release oxygen, thereby improving air quality and purifying the air.

2. Adjust the three highs. Yew contains golden pine and double brass components, which is beneficial to improving microcirculation, and can also dissolve excess oil attached to the blood vessel wall and restore the elasticity of the blood vessel wall, thus reducing the three highs.

Yew is a tree of the genus Taxus of the Taxaceae family, with a height of 30 meters and a diameter at breast height of 60-100 centimeters; the bark is grey-brown, reddish-brown or dark brown; the winter buds are yellow-brown or light brown. Or reddish brown, shiny, bud scales are triangular and ovate, with no or longitudinal ridges on the back.

The leaves are arranged in two rows, strip-shaped, slightly curved or straight, dark green and shiny above, light yellowish-green below, with two stomata. The male cones are light yellow, with 8-14 stamens and 4-8 anthers. The seeds are born in a cup-shaped red fleshy aril, often oval in shape, narrowing at the upper part, sparsely obovate, slightly flat or round, with a protruding short blunt tip at the apex, and the hilum is nearly round or broadly elliptical. shape.

Yew trees are endemic to China and are found in southern Gansu, southern Shaanxi, Chongqing, northeastern and southeastern Yunnan, western and southeastern Guizhou, western Hubei, northeastern Hunan, northern Guangxi and southern Anhui (Huangshan), often grows in the upper parts of mountains above 1000-1200 meters above sea level. It is cultivated in Lushan, Jiangxi.