Why is it difficult for potted osmanthus to bloom?
This article provides a detailed introduction to the topic of making盆景 (bonsai) with osmanthus. Why is it difficult for potted osmanthus to bloom? Let's follow the editor to find out!
Osmanthus can tolerate temperatures as low as -5°C and can survive the winter outdoors in the Yangtze River Valley. In the north, if the temperature drops below -7°C for several days, it will suffer frost damage, manifesting as dried leaf tips or leaf drop. Therefore, most potted osmanthus plants are brought indoors to overwinter. However, if the indoor temperature is too high and does not reach the required low temperature (below 5°C), it will affect the differentiation of flower buds. After overwintering, if the temperature exceeds 15°C, new shoots will germinate prematurely, resulting in thin and weak branches that will not bloom.
Due to poor management the previous year, the occurrence of diseases and pests can cause early leaf drop, affecting the plant's storage nutrition level and the formation of flower buds.
Osmanthus begins to germinate in late March, reaches its growth peak in mid-April, and stops growing in mid-to-late May. The period of new shoot growth is short and concentrated. If nutrition is not sufficient during this time, the branches will be thin and long, and the leaves will be pale, also affecting the formation of flower buds.
Osmanthus requires a high level of sunlight, and without at least 8-12 hours of full sunlight per day, flower buds cannot form.
The initial period of osmanthus flower bud differentiation is in late May, with a large number of buds differentiating in June and further development of the flower organs in August. The spring shoots are the flowering position. During the period of flower bud differentiation, excessive soil moisture or a lack of phosphorus and potassium fertilizers can also affect the differentiation of flower buds.
To make potted osmanthus bloom, it is necessary to ensure: healthy roots, sufficient and comprehensive nutrient soil as the foundation for the formation of flower buds. Sufficient sunlight is a prerequisite, and robust new shoots, efficient and high-quality leaves, and a high level of stored nutrition are key to flowering. Applying phosphorus and potassium fertilizers during the period of flower bud differentiation and moderately controlling water are guarantees for flowering. To ensure that potted osmanthus blooms, it is necessary to overwinter in a cold room, provide sufficient sunlight, apply nitrogen and potassium fertilizers before germination, apply phosphorus and potassium fertilizers before flower bud differentiation, and ensure a high level of tree nutrition.
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