How to grow Ulmus pumila bonsai

1. Maintenance methods

1. Soil: The small-leaved elm has low requirements for soil and can grow in acidic, alkaline and neutral soils. When cultivating bonsai, loose, fertile, neutral soil is needed, which is beneficial to its growth.

2. Light: Ulmus pumila needs long-term light. The potted plant can be placed in a sunny place indoors, and it is very sun-resistant, so there is no problem even if it is exposed to strong light.

3. Watering: Ulmus pumila prefers a humid environment, so water it frequently. Generally, water the plants 1-2 times a day in summer, once a day in spring and autumn, and once every two days in winter. In addition, you can spray water on the leaves every day to keep them moisturized.

4. Fertilization: The growing period of Ulmus pumila is from April to October, and it needs sufficient nutrients during this stage. Generally, fertilizer should be applied every 15 days, and it is advisable to use organic fertilizer rich in nitrogen, phosphorus and potassium.

2. Breeding techniques

The seeds of Ulmus pumila are not easy to obtain and are generally propagated by cuttings, with a survival rate between 20% and 40%. Choose 1-2 year old branches, about 7-8 cm in length. Apply indolebutyric acid to the base of the branches to promote rooting, then wash them with clean water. Choose soil with good drainage and ventilation as the substrate, insert the cuttings into the substrate, water thoroughly and place them in a sunny place. It is necessary to spray water around frequently to maintain a high humidity.

3. Pest and disease control

1. Diseases: Common diseases are root rot and branch witches' broom. Root rot can cause leaves to turn yellow and fall off, and branches to die. The plant needs to be removed and the damaged roots trimmed, then applied with fungicide and replanted. Witch's broom disease mainly harms new shoots and leaves. The diseased leaves need to be cut off and burned, and then sprayed with lime sulfur.

2. Pests: There are many pests, such as scale insects, longhorn beetles, and caterpillars, which are harmful to Ulmus pumila. They can be killed by spraying with DDT.