Bougainvillea bougainvillea is a common flowering shrub in gardens, which is mostly white and looks like snow in a pink field from a distance.

[Morphological characteristics]

Deciduous shrub with reddish-brown twigs and flaky old branches. Leaves opposite, short-stalked, ovate to ovate-lanceolate. From May to June, white flowers with pink rings will bloom and gather into panicles. The capsule is nearly spherical with persistent apical receptacle, and it matures in June 10 ~ 1 1 (see color map 1 19).

Common cultivated varieties are:

Deutzia angustifolia leaves elliptic, ovate or ovate-lanceolate.

There are yellow spots on the leaves of the summer solstice.

Many different leaves have white spots.

White flowers are pure white.

The surface of the evening primrose flower is rose purple.

The flower of Vatri variety is white with magenta spots on the surface.

Also belonging to plant cultivation and appreciation are Dendrobium nobile in Ningbo and Dendrobium glaucum in Huangshan. Two flowers are white, single, multiple and dense. The former has thin and slightly drooping branches, narrow and hard leaves, white back, poor stress resistance and dryness; The latter has thick branches, wide leaves and slightly larger flowers, and likes wet and cool environment.

[distribution]

Produced in the Yangtze River valley of China and Japan.

[habit]

Long-term cultivation, positive tree species, slightly tolerant to shade and cold, thrive in weak acid and neutral soil rich in humus. Strong germination and pruning resistance.

[Propagation, Cultivation and Maintenance]

Propagation by cutting, sowing, layering and dividing plants. Prune dormant branches from late February to early March, and select 1 annual branches, with the length of 8 ~ 10 cm and the row spacing of 5 cm×10 cm; Semi-mature cutting was carried out from late June to early July, and the survival rate could reach 90%. Sowing, harvesting in autumn, sealed and stored until the next spring sowing. Because the seeds are small, cover the grass with soil, uncover the grass several times after emergence, and then set up a shed to shade it. Seedlings grow slowly, so they should be carefully maintained, planted separately in the next spring, and cultivated for 2 ~ 3 years before going out for greening. Transplanting is carried out at defoliation stage, and overnight soil is generally used. Prune dead branches every winter or early spring after planting. After the flowers wither, the remaining inflorescences should be cut off in time.

The cold resistance of dredging is poor, and all branches will be freeze-dried in the severe winter season in the north. However, due to the strong ability of rhizosphere germination, new plants can germinate in the early spring of the following year, and flower buds differentiate with the growth of new branches, and can bloom after summer. Therefore, the stubble should be updated every year after winter, and no pruning is needed during the growing period. Branches in warm areas will not be frozen, and can be updated 1 time in 2 ~ 3 years, maintaining a large crown width, and using side branches to increase the flowering position.

The main pests and diseases are: dredging leaf spot, kidney moth, aphid and so on. Prevention and control methods: remove diseased leaves and burn them, spray Bordeaux mixture or carbendazim at the initial stage of the disease, and spray dichlorvos or cartap at the larva or nymph stage of pests.

[Appreciation and Application]

White flowers bloom in summer, dense and elegant, with a long flowering period. Suitable for planting on lawns, hillsides, roadsides and forest margins, and can also be used as flower hedges.