1. The flowering habit of Rhododendron, the natural flowering period of Rhododendron (Xi Juan) is from April to May. It takes a period of low-temperature exercise (about 4~7℃) to complete flower bud differentiation in the first summer, and then it can bloom quickly if the suitable temperature conditions are met. According to the inherent law of rhododendron bud differentiation, artificial control.
2. Early flowering measures. If the flowering period of azaleas is advanced to the Spring Festival, the following measures can be taken:
(1) temperature treatment in order to advance the flowering period of rhododendron to the Spring Festival, it is necessary to move the rhododendron which has been tempered at low temperature to indoor cultivation in advance. The common early flowering varieties were moved from the cold room to the greenhouse in the middle of June 5438+February, so that the temperature gradually rose to 15~20℃ (note: the temperature must be gradually increased to make the plants adapt to the temperature). After entering the greenhouse, spray it on the branches and leaves every day. Continue to raise the temperature to 25~30℃ and spray it on plant branches and leaves frequently to keep the relative humidity of air above 80%. During this period, special attention should be paid to the fact that the temperature should not be too low, and the temperature at night and on cloudy days should not be lower than 15℃, otherwise it will lead to untimely flowering and bud dropping, while the temperature above 35℃ will easily lead to defoliation and shorten the flowering period. Through the temperature treatment in this period, the dormancy of flower buds can be released early, and their buds can grow and develop ahead of time.
(2) In order to make rhododendron blossom before the Spring Festival, when the weather turns cold in September, gibberellin is sprayed outside the roots for 65,438+000 mg/kg, 65,438+00 ~ 65,438+05 days for 65,438+0 times to promote flower bud development; You can also use 500~ 1000 mg/kg gibberellin to sow flower buds, once a week, four times in a row, and at the same time strengthen water and fertilizer management to create a high temperature and high humidity environment.
3. Measures to delay flowering: Put the plants that have formed flower buds but have not yet opened in a cold room at 2~4℃, keep the low temperature for 3~4 hours every day, without airing or watering, postpone the flowering period until the date when they are taken out of the cold room in September ~ 10, 15~ 20 days earlier than the scheduled flowering period, and place them in a cool and dark place for maintenance.
With the help of temperature regulation technology, potted rhododendron can be open all year round.