Planting Tips

Chapter 49 How to regulate the flowering period of flowers
The flowers are varied and beautiful.However, due to the limitations of natural conditions such as light and temperature and the growth and development of flowers themselves, some flowers can only be opened at a certain time every year.Due to the needs of some festivals and relatives and friends' celebrations, people hope that certain flowers can bloom in the required time, that is, to open regularly according to people's will.This just needs to be artificially regulated to florescence, namely so-called " urging a hundred flowers in a moment, gathering four seasons in a moment ".Those whose flowering period is earlier than the natural flowering period are called promoting cultivation, and those who are later than the natural flowering period are called suppressing cultivation.

In order to make flowers bloom in a timely manner according to people's needs, it is necessary to have a deep understanding of the growth and development laws of various flowers, be familiar with the requirements of various flowers for environmental conditions in different growth and development stages, and use the adjustment of environmental conditions and the growth process of flowers themselves. method to regulate flowering.Commonly used technical measures are the following four.

(1) Temperature treatment ① Heating treatment: For flowers that need to form flower buds at a higher temperature, such as rose, jasmine, Milan, cineraria, gloxinia, periwinkle, geranium, etc., as long as they are heated in advance, they can Opens up on schedule when it needs to bloom.For flowers that are dormant and overwintering but have formed flower buds, such as plum blossoms, peonies, green peaches, winter jasmines, etc., after being subjected to frost and snow, move them indoors, gradually warm them up, keep the room temperature at 15-25°C, and spray them frequently to bloom early. ②Low temperature treatment: mostly used for dormant overwintering flowers, such as rhododendron, plum blossom, green peach, etc. If they are not allowed to bloom in spring, they can be placed in a cold cellar at 2-5°C, and watered about once every half a month, which can delay the flowering period To "May Day" or "National Day".

(2) Sunshine treatment ①Short-day treatment: This method can make short-day flowers bloom in advance, such as chrysanthemum, poinsettia, bougainvillea, and crab claw.After this kind of flower grows vigorously, it is treated with shading treatment, and the whole plant is often covered tightly with black cloth (or black plastic), and only 8-10 hours of light are given every day. After this treatment, it can bloom in advance after 50-60 days. ② Long-day treatment: Long-day treatment can delay the flowering period of short-day plants. For example, before the flower buds of chrysanthemums are not differentiated (late August), supplement the light with light every day, so that the daily light time exceeds 8 hours. Inhibit the formation of flower buds and delay flowering; conversely, the method of adding light can also be used to make long-day flowers bloom in advance.

(3) Chemical treatment Treating flowers with plant growth regulators can break dormancy, promote flower bud differentiation, and flower in advance.

For example, treating hydrangeas, rhododendrons, cherry blossoms, etc. with 200-400 mg/kg gibberellin is effective for breaking dormancy.

(4) Cultivation measures Use cultivation measures such as sowing, cutting, pruning and topping of flowers at different periods to control the flowering period.For example, Gladiolus adopts the method of planting in stages, which can achieve flowers in all seasons; Yichuanhong adopts topping measures, which can delay the flowering period by more than 20 days; Dahlia takes about 120 days from cutting to flowering, and the flowering period can be adjusted by using staged cuttings to raise seedlings.

(End of this chapter)