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How to divide Ilex North America into male and female plants
North American holly distinguishes male and female plants by flowers;

1, male flower:

The inflorescence (1) has 3-4 branches, the total pedicel length is 7- 14 mm, the secondary axis length is 2-5 mm, the pedicel length is 2 mm, and each branch has 7-24 flowers.

(2) The flowers are lavender or purplish red, and the cardinal number is 4-5; Calyx shallow cup-shaped, lobes broadly ovate-triangular, ciliate; Corolla radial, about 5 mm in diameter, petals ovoid, 2.5 mm long and 2 mm wide, reflexed when opened, slightly connate at the base.

(3) Stamens are shorter than petals, 65438 0.5mm long, and anthers are oval; Degenerate ovary conical, less than 65438 0 mm long.

2. Female flower:

The inflorescence of (1) has 1-2 branches and 3-7 flowers. The total pedicel is about 3- 10 mm long, flat and the secondary axis is stunted.

(2) The pedicel length is 6-65438 00 mm; Calyx and petals are male flowers, the length of staminodes is about 1/2 of petals, and abortive anthers are heart-shaped; Ovary ovoid, stigma with inconspicuous 4-5 lobes, thick disk. The fruit is spherical, red at maturity, long 10- 12 mm, and 6-8 mm in diameter.

(3) The nucleus is 4-5, narrowly lanceolate, 9- 1 1mm long and about 2.5mm wide, with smooth and concave back, triangular cross section and thick leathery endocarp. The flowering period is from April to June, and the fruiting period is from July to 65438+February.

Extended data:

1, environmental requirements:

Holly is suitable for planting in humid and semi-cloudy places, likes fertile soil and can grow well in general soil, and has no strict requirements on the environment.

2. Planting method:

(1) sowing:

After the fruit matures in autumn, it is harvested, peeled and rinsed, and the seeds are treated with low temperature and wet sand to accelerate germination, and planted before March of the following spring. Seedling growth is slow, so it should be carefully maintained and managed. Holly seeds usually germinate every other year if they don't germinate.

(1) Cutting:

In the rainy season, it is advisable to adopt softwood cutting, the cutting length is 6 ~ 8 cm, and the lower leaves are cut off, leaving only L ~ 2 leaves and short cuttings, and the cutting depth is 1/2. After cutting, sand should be used as the substrate, shed for shade, and water should be sprayed frequently to keep moisture, and it will take root after about 1 month.

3. Water and fertilizer:

The seedlings planted in that year can grow naturally by watering once, and watering once every 15 days according to the soil moisture. Combined with intertillage weeding, topdressing 1 ~ 2 times a year is appropriate in spring and autumn, and dilute liquid fertilizer mainly containing nitrogen is generally applied.

4, plastic pruning:

Holly sprouts and grows branches many times a year, which is extremely resistant to pruning. It should be pruned once in summer, and it can be pruned into a flat shape or a spherical shape or a conical shape in autumn according to different greening needs, and the branches should be properly thinned to maintain a certain crown-shaped branching state. Measures such as piling up soil to prevent cold can be taken in cold places in winter.

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