Cold-resistant variety Hongguo privet
Ligustrum rubrum belongs to Ligustrum genus of Oleaceae. It is distributed in the 1500-meter-high alpine region of Luoxiao Mountain Range. It is an evergreen shrub or small tree, 5-7 meters high, with branches and pedicels purple red. Its leaves are elliptic, 6-8 cm long, 3-4 cm wide, and pale purple red. Terminal panicles, 6-8 cm long. Fruit long elliptic, pseudoberry drupelike, seed 1. Flowers in May, fruit in August, branches red fruit numerous, extended to October does not fall. This variety has strong adaptability, fast growth, high germination rate, pruning resistance, low temperature of minus 20-22℃, and can be cultivated in the open field in Beijing microclimate. It can resist sulfur dioxide, chlorine and hydrogen oxide. Normal growth occurs in alkaline soils with pH 8-9.
Propagation: 1. Seed propagation: After seed harvesting, after 5-7 days of post-ripening period, then wipe off seed coat, wash out seeds in clear water, dry slightly, mix with moist fine sand, sow in December, northern areas can be extended to March, April-May of the next year, transplant seedlings, plant in the field in the second year, and then leave the nursery after 2-3 years. 2. Cutting propagation: spring and summer, spring in March, summer in June-July, cutting must be lignified, 7-8 cm long, with 1-2 leaves, the lower part cut into a horse ear shape, cutting bed substrate with fine loess mixed with 1/3 of fine sand, fully sprinkled after planting, arch shed covered with film, and shade with a sunshade net.
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Pollution-resistant evergreen broad-leaved tree-privet
Privet belongs to Oleaceae. Ligustrum lucidum belongs to evergreen trees. First, habitual privet originates from China and Japan, likes light, can endure shade, likes warm and humid climate, is suitable for slightly acidic to slightly alkaline or calcareous soil, can also grow in clayey soil with 0.2% salt content, can withstand low temperature of-12 ℃, is not resistant to barren, deep roots, developed whisker roots, fast growth, strong sprouting ability, and resistance to pruning. It is not strict about climate, but it is suitable to be planted in humid, leeward and sunny places, especially in deep, fertile and humus soils.
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How to make oleander form a "trigeminal and nine tops" crown?
Oleander is a three-leaf whorl, which is a typical trigeminal branch, that is, three new branches are produced from the stem nodes after each pruning. People can make use of its branching feature to trim and reshape it to make it "trigeminal and nine tops". When the trunk grows to a certain height, three main techniques can be produced from the trunk. When the main branch grows to more than 20cm, each branch will retain 20cm before topping to make it sprout new technology. There are 3 more branches on each main branch, 20 cm-30 cm in each branch, and all the upper branches.
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