Detailed Explanation of Key Techniques for Planting Black Locust (Robinia pseudoacacia) in Autumn and Winter

Black locust (Robinia pseudoacacia) is widely used in landscaping for its strong adaptability, but surveys have found that some black locusts do not grow vigorously after planting, and the reason for this is largely related to improper planting techniques. Key techniques for stem-truncated planting of black locust in autumn and winter:

1. Planting time: plant as soon as possible after all leaves have fallen in November each year.

2. Seedling specifications: for general barren hill afforestation, select seedlings with a ground diameter above 1 cm; for roadside greening, select large seedlings with a ground diameter above 2.5 cm; when planting, keep the root system intact, with a root spread of no less than 20 cm and a length of no less than 25 cm.

3. Planting method: adopt the method of digging the hole and planting at the same time. When digging the hole, separate the topsoil from the subsoil. The planting depth should be the same as or slightly deeper than the original burial depth of the seedling. When filling soil, put the topsoil in first, then the subsoil.

4. Precautions: (1) Before planting, trim the root system and cut off rotten and split roots. (2) Stem truncation can be done at the same time as planting, or 7 to 10 days after planting. (3) The stem truncation height should be 3 to 5 cm above the ground. After truncation, cover with soil.

Choosing to plant in late autumn and early winter has two advantages: first, it comes right after the rainy season, and the soil moisture is better than in spring, which is good for root growth; second, the roots have already recovered and grown for a period before the severe winter arrives, so the seedling revival period the following spring is short, and once the temperature is suitable the roots grow and quickly sprout new buds to form new branches, thereby increasing the planting survival rate.