Solutions for flowers that do not bloom or bloom sparsely
1. Growth and development stage: After seeds are sown, they must go through a certain period of juvenile stage before they can enter the adult stage capable of reproductive growth. Therefore, flowers that are still in the juvenile stage cannot bloom even under the most ideal environmental conditions. Different species of plants, or different cultivars of the same species, have different lengths of juvenile stage, ranging from 1 to 2 years at the shortest to several decades at the longest. For example, pomegranate generally takes 4 to 5 years from sowing to blooming, but some cultivars can bloom in the same year they are sown. If juvenile-stage vegetative organs are used as propagation material during flower propagation (such as cuttings, layering, grafting), then the propagated plants will still be in the juvenile stage and will not bloom for a certain period of time.
2. Nutrient deficiency: Plant blooming requires sufficient nutrients. If there is an inadequate supply of fertilizer, or if the plant grows very weakly due to reasons such as too small a pot or long-term failure to repot, it cannot provide sufficient nutrients for blooming, resulting in no blooming or sparse blooming. For example, jasmine can bloom continuously from June to early October, which consumes a great deal of nutrients. If sufficient fertilizer and water are not supplied in time, its normal blooming will be affected, hence the saying
"Clear-water jasmine does not bloom" (only watering without fertilizing). If the plant cannot get fertilizer and water supplementation, vegetative growth will weaken, and there will be no flowers or very few flowers.
3. External environmental conditions: When external conditions such as temperature, light, water and nutrients cannot meet the habits and growth requirements of the flower, the plant will also fail to bloom or bloom sparsely.
Temperature: Flower blooming requires a certain temperature. For example, jasmine can only develop flower buds above 25°C, and the buds can only develop well above 30°C; another example is cyclamen, which cannot form flower buds below 5 to 6°C.
4. Light: Some flowers, such as pomegranate, hibiscus, Chinese rose, jasmine and Aglaia odorata, prefer abundant sunlight. In overly shaded places they will grow poorly, bloom late, bloom sparsely, or even not bloom at all.
5. Water: Some flowers need appropriate water control during the flower bud differentiation period, that is, when transitioning from vegetative growth to reproductive growth, in order to inhibit vegetative growth, promote reproductive growth, and facilitate flower bud differentiation and more blooming.
6. Nutrients: During the flower bud differentiation stage, if too much nitrogen fertilizer is applied, the plant is prone to excessive vegetative growth, causing late blooming, sparse blooming, or even no blooming. Applying more phosphorus fertilizer can promote flower bud differentiation and blooming.
1) Massive leaf loss: Before flower bud differentiation, if a large number of leaves fall due to pest or disease infection or damage, or allergic reaction to a certain pesticide, or root rot, etc., it will seriously affect the synthesis of nutrients necessary for flower bud differentiation, thereby hindering flower bud differentiation and resulting in no flowers to enjoy. For example, rhododendron can only form flower buds after the branch has 8 to 10 leaves; another example is plum blossom, where leaf loss before late July prevents flower bud formation, leaf loss before mid-to-late August can only form a small number of flower buds, and if leaves fall after mid-September, blooming will no longer be affected because the flower buds have already fully formed.
2) Improper pruning: For example, pomegranate blooms on the current year's branches. Generally, each fruiting branch produces 1 to 5 flowers, of which 1 is terminal and the rest are axillary. Therefore, during the growing period, the short-cutting pruning method should not be used, so as to avoid cutting off the blooming parts and affecting blooming.