How should Lacebark Pine seeds be selected? What are the seedling-raising methods?

Lacebark Pine, also called White-bone Pine and Coiling Dragon Pine, is an evergreen tree with a distinct trunk, tall and upright, with a verdant crown and great ornamental value. At present, Lacebark Pine is often used in landscaping, mostly planted in parks, courtyards or streets, and has good economic value, thus it is welcomed by many growers. So how should Lacebark Pine, a tree species unique to northern China, be selected and raised as seedlings? Let's take a look.

How should Lacebark Pine seeds be selected?

There are many different Lacebark Pine varieties on the market. According to the length of the needles, they can mainly be divided into long-needle, medium-needle and short-needle varieties, and their tree shapes and growth rates are all different, so when choosing a variety you must make comparisons in many aspects. In addition, Lacebark Pine seeds are also divided into those from Gansu, Shanxi, and Shaanxi Lantian or Baoji, among which. The seeds from Gansu are good, from old natural trees deep in the mountains, but the quantity is very small.

What are the seedling-raising methods?

1. Seedling-raising methods

Lacebark Pine seedling raising is mainly done in open-field seedbeds, and plastic low-tunnel sowing for seedling raising is also used. The nursery site should be chosen as flat land with well-drained sandy loam and loam, and low-lying places with poor drainage and prone to waterlogging in the rainy season must not be chosen for seedling raising.

2. Seedling-raising containers

① Foldable honeycomb bottomless plastic film containers. Container specifications are 5cm×12cm, container wall thickness is 0.02mm.

② Soft plastic containers. Specifications are 8cm×15~16cm, with 6~8 small holes at the bottom.

③ Mesh bag containers. General specifications are 5cm×8cm. According to specific circumstances, they can be placed in trays or root-control plug trays.

3. Bed making and container placement

The direction of the seedbed should preferably be north-south. Dig drainage ditches around the seedling-raising land so that there is no water accumulation inside and no flooding outside. Generally, low beds are used for seedling raising, and the depth and width of the bed are determined according to the container specifications.

When filling foldable honeycomb plastic film containers with soil, they need to be pulled open and laid horizontally in the seedling bed first, and their pulled-open length is exactly 80 cm, equal to the width of the seedling bed, so that each container forms a hexagon, then fixed.

Soft plastic containers should be filled with nutrient soil, and after filling they should be placed neatly in the bed. After the containers are arranged, the top should be level, and slightly higher than the ground or level with the ground to facilitate drainage.

4. Seed treatment and sowing

Before sowing, first soak the seeds in a 0.5% potassium permanganate solution for 20 minutes for disinfection, then rinse them with clean water, then soak them in 40°C warm water for 48 hours, remove them and let them cool slightly, then they can be germinated. When 1/3 of the germinated seeds show white, they can be sown. Sowing time varies from place to place, and sowing within 10 days after the soil thaws in spring is best. The sowing depth should preferably be 1 cm, and must not be too deep. After covering with soil, press lightly so that the seeds are in close contact with the nutrient soil, and finally cover with branches, straw and other materials to keep the seedbed moist.

5. Seedling stage management

Half a month after the seedlings emerge completely, start thinning the seedlings, but it should be done in several rounds, and in the end 1 plant per bag is best; from emergence to the early growth stage, prevent sunscald and ensure the water needed during the growth period of the seedlings (one-year-old seedlings generally do not need fertilization); before emergence, use 50~80 ml of commercial 24% oxyfluorfen emulsifiable concentrate per mu, mix with 30 kg of water, and spray as a soil treatment, which can effectively control annual monocotyledonous and dicotyledonous weeds and is safe for emergence.

Lacebark Pine has a deep root system and tolerates barren soil. It grows well in deep, fertile calcareous soil or loess. In the management process of seed selection and seedling raising, correct treatment must be carried out according to the habits of Lacebark Pine at each stage. Generally, by October-November of the second year, its cones are mature.

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