What plants to plant on the balcony to prevent noise

I'm afraid this won't work, or use it according to the soundproof glass.

1. Coral trees.

Coral tree is also known as early grass tree (Guangzhou, Huiyang), the branches are straight, the bark is gray-brown, with round skin holes, the leaves are opposite, oblong or inverted-lanceolate, the surface is dark green and shiny, the back is pale green, and it is green all year round. Coral trees have the function of cancelling noise.

2. Cedar. Cedar is a plant of the cedar genus in the family Pinaceae, and cedar has the function of cancelling noise. Cedar is an evergreen tree with a pinnacle-shaped crown with flattened branches and slightly drooping branches. The leaves are needle-shaped, 8-60 cm long, hard, grayish-green or silvery-gray, scattered on long branches and clustered on short branches.

3. Juniper. Juniper is an evergreen tree; Twigs with scaly leaves rounded or nearly square. The leaves are all thorn-shaped on young trees, and the spiny leaves are gradually replaced by scaly leaves with the growth of age. The spiny leaves 3 impellers are alternately or alternately opposite, 6-12 mm long, obliquely spread or proximal, the lower part is clearly exposed, and there are two white stomatal bands on it, which can eliminate noise.

Fourth, the dragon cypress. It is a tree with a height of 21 meters and a diameter at breast height; The bark is dark gray, longitudinally lobed, and cracked in strips; The branches of young trees usually stretch diagonally upwards to form a pinnacle-shaped crown, while the older ones flatten the lower branches to form a broadly rounded canopy, and the bark is grayish-brown, longitudinally lobed, and cracked into irregular flakes that fall off.

5. Metasequoia. Metasequoia is a deciduous tree with opposite branchlets and drooping. The leaves are linear, alternately opposite, pseudo-two rows into pinnate compound leaves, cm long, with 4-8 stomatal lines on both sides below. Monoecious.

cones drooping, nearly spherical, slightly 4-edged, centimeter long, with long stalks; Seed scales woody, shield-shaped, each scale with 5 9 seeds, seeds flattened, with narrow wings around it.

The question is relatively small.