In the real-world transactions of greenery seedlings, the quality of the seedlings directly impacts the quality of planting, survival rate, maintenance costs, and the overall greening effect. Therefore, both the entities using the seedlings and the suppliers of the seedlings need to pay attention to the basic standards for high-quality seedlings.

High-quality seedlings should meet the following standards:

1. The root system is well-developed and complete, with a short and straight taproot, a sufficient number of lateral and fibrous roots in the vicinity of the root collar, an appropriate canopy-to-root ratio, and a large root system without splits.

2. The seedlings are robustly growing, with full branches and strong resistance.

3. Seedlings have robust and straight trunks (except for vines), with considerable height, and branches do not grow excessively.

4. The primary roots are evenly distributed, and the tree crown is symmetrical and full. Among them, the lower branches of evergreen coniferous trees do not wither and fall, forming bare trunks. Certain coniferous trees with strong stems and no latent buds exhibit a pronounced apical dominance, with lateral buds developing plumply.

5. The trees are free from diseases, pests, and mechanical damage.

In order to enhance the survival rate of high-quality landscaping trees, factors such as the shape and size of the tree canopy, as well as the age of the seedlings, significantly impact the survival rate after planting. These factors are also related to the adaptability and resistance of the trees once they have survived. Therefore, when transplanting different varieties, attention must be given to their specific canopy shapes and tree ages.

1. Alley trees. The trunk height is appropriate, with fast-growing species like Poplar and Willow having a chest diameter of 4-6 cm, while slow-growing species like Sophora, Ginkgo, and Acer truncatum have a chest diameter of 5-8 cm, with exceptions for large-sized seedlings). The branching points are at a consistent height, featuring 3-5 evenly distributed and properly angled main branches. The branches and leaves are dense, and the trunk is intact.

2. Flowering shrubs. With 3-6 main stems or branches, height around 01 feet, evenly distributed, with branching at the base of the trunk, and a full, lush canopy.

3. Solitary trees should have straight trunks, elegant individual shapes, and distinctive features. Canopy trees should have a height of 2.01 meters or more; evergreen trees should have complete crowns, lush foliage, and new branches growing; coniferous trees should not have withered base and lower branches, appearing full and dignified.

4. Green Hedges: Seedlings are uniform in height from 50 to 200 cm, with no balding or bare areas at the bottom; spherical crown seedlings have dense foliage.

Tobata: There are 23 perennial main vines without any withered branches.