Why doesn't a potted osmanthus bloom?
Reasons an osmanthus doesn't bloom include insufficient light. Osmanthus loves light; during the vegetative growth period, when light intensity is below 30°C, its growth and development decline, vegetative growth worsens, and the number of flowers decreases. When light is severely insufficient, because photosynthesis weakens and nutrient accumulation is low, it cannot bloom, so the osmanthus needs to be given sufficient light.
Lack of fertilizer. The growth and flowering of osmanthus are considerable and consume large amounts of nutrients. Poor or infertile potting soil will also affect the plant's growth and flowering, so when new shoots emerge, apply 1-2 applications of a nitrogen-based fertilizer, and from the flower bud differentiation stage (beginning at the end of May) until before flowering, apply 2-3 applications of a phosphorus-based fertilizer.
Potting soil too wet. Osmanthus dislikes excessive moisture and waterlogging; wet waterlogging causes root rot, leading to poor growth and failure to bloom, and in severe cases can cause the potted plant to die. Watering should follow the principle of "don't water if not dry, water thoroughly when you do," and after heavy rain and torrential rain, promptly pour out any standing water in the pot.
Soil on the alkaline side. Osmanthus prefers slightly acidic soil, with a pH of 5.5-6.5 being suitable. Osmanthus grown in alkaline soil often grows poorly, which affects flowering.
Smoke and dust pollution. Osmanthus is not tolerant of smoke, dust and pollution; when there is too much smoke and dust or after exposure to pollution, the leaves become smaller, fall off easily, and the phenomenon of only growing leaves and not blooming appears.
Not yet of flowering age. An osmanthus will not bloom until it reaches flowering age.
Why doesn't a potted osmanthus bloom
Osmanthus is mostly propagated from cuttings and grafted seedlings, and the time to flowering is short. A cut osmanthus flowers in its fourth year; grafted golden osmanthus, silver osmanthus and dan osmanthus may have 1/5 flowering in the second year, while four-season osmanthus flowers in the same year, but in cultivation, quite a few potted osmanthus still fail to bloom when they reach flowering time. Yet some osmanthus is still found not to bloom; why is this?The reasons an osmanthus doesn't bloom mainly include the following 8 aspects:
1. Brought indoors too early, with the temperature above 10°C, the osmanthus cannot get sufficient dormancy. This makes the osmanthus sprout and unfold leaves too early, consuming large amounts of nutrients, and combined with insufficient light and a weakened plant, affects flowering.
2. After being moved outdoors in spring, wind and sun dry out the leaf tips, and even if new buds grow again, it is not easy for it to bloom.
3. Insufficient nutrients. Osmanthus loves fertilizer; some potted osmanthus are not repotted or given new soil for several years, resulting in insufficient nutrients, and the root system becomes root-bound and cannot spread, affecting flowering.
4. Insufficient light. Osmanthus needs more than 10 hours of light, otherwise the leaves are not lush, affecting flower bud formation and thus preventing flowering.
5. Overwatering. This causes root rot and leaf drop, affecting flowering.
6. Too much nitrogen fertilizer. This makes the branches and leaves grow excessively, affecting flowering.
7. Smoke, dust and grease pollution. Osmanthus is not tolerant of smoke, dust and grease; when the leaves are polluted by smoke, dust and grease over a long period, growth is poor, and the leaves may even fall off, affecting flowering.
8. Lack of pruning. Osmanthus has a well-developed root system and strong sprouting ability; if not pruned appropriately, the branches and leaves become too dense, affecting flowering.
To make a potted osmanthus bloom, corresponding measures should be taken according to the reason it is not blooming.
1. Ensure low-temperature winter dormancy. The overwintering temperature for potted osmanthus is 3-5°C; above 3°C it need not be brought indoors, keeping it at natural temperature; below 3°C, bring it indoors. After being brought indoors, let it go dormant at low temperature, and only then can it grow vigorously the next year with abundant flowers and lush leaves.
2. When moving it outdoors in spring, move it outside on a cloudy day or a rainy day; never move it out on a scorching day and expose it to sudden sun, but let it gradually adapt to the outdoor environment.
3. Ensure long-day sunshine; there should be more than 10 hours of sunlight per day to meet its sunshine needs.
4. Water reasonably. It should maintain 30% water content; in hot summer, 60% water content is suitable; do not let it get too dry or too wet.
5. Nitrogen fertilizer should not be excessive; it should be applied together with phosphorus and potassium fertilizers. Osmanthus needs more phosphorus and potassium fertilizer and can be top-dressed through the roots, spraying the leaves with 0.1%-0.2% monopotassium phosphate.
6. Prevent pollution. You can gently wipe the leaves with fine gauze to keep the leaf surface clean, wiping once every 15 days, to facilitate photosynthesis and make the plant grow robustly.
7. Potting soil that has been used for too long should be replaced. Replace the potting soil once every 1-2 years; when repotting, a small amount of hoof pieces can be applied at the bottom of the pot as a base fertilizer.
8. Prune appropriately. Before moving it outdoors, cut off diseased and weak branches and overly dense branches, and shorten them appropriately according to the plant shape, so as to improve ventilation and light penetration and promote flowering.
Why doesn't a potted osmanthus bloom?
China Landscape Web, September 22 news: Reasons an osmanthus doesn't bloom include insufficient light. Osmanthus loves light; during the vegetative growth period, when light intensity is below 30°C, its growth and development decline, vegetative growth worsens, and the number of flowers decreases. When light is severely insufficient, because photosynthesis weakens and nutrient accumulation is low, it cannot bloom, so the osmanthus needs to be given sufficient light.
Lack of fertilizer. The growth and flowering of osmanthus are considerable and consume large amounts of nutrients. Poor or infertile potting soil will also affect the plant's growth and flowering, so when new shoots emerge, apply 1-2 applications of a nitrogen-based fertilizer, and from the flower bud differentiation stage (beginning at the end of May) until before flowering, apply 2-3 applications of a phosphorus-based fertilizer.
Potting soil too wet. Osmanthus dislikes excessive moisture and waterlogging; wet waterlogging causes root rot, leading to poor growth and failure to bloom, and in severe cases can cause the potted plant to die. Watering should follow the principle of "don't water if not dry, water thoroughly when you do," and after heavy rain and torrential rain, promptly pour out any standing water in the pot.
Soil on the alkaline side. Osmanthus prefers slightly acidic soil, with a pH of 5.5-6.5 being suitable. Osmanthus grown in alkaline soil often grows poorly, which affects flowering.
Smoke and dust pollution. Osmanthus is not tolerant of smoke, dust and pollution; when there is too much smoke and dust or after exposure to pollution, the leaves become smaller, fall off easily, and the phenomenon of only growing leaves and not blooming appears.
Not yet of flowering age. An osmanthus will not bloom until it reaches flowering age.