How to prevent and control leaf spot disease in Clivia miniata in winter? Master the key points of careful care
Clivia miniata is a flower that people love. It likes warmth and light, is not tolerant of cold, and is easy to keep alive but not easy to keep thriving. To grow Clivia miniata well in winter, special attention should be paid to strengthening management, with extra effort devoted to the following 5 aspects.
1. Soil and fertilizer management. Clivia miniata likes loose, fertile neutral or slightly acidic humus soil. The growing medium can be mixed from 65% humus soil, 20% clean sand, and 15% fine furnace ash. From the Autumn Equinox to the Winter Solstice, apply a solid fertilizer once to Clivia miniata, with less nitrogen fertilizer and more phosphorus and potassium fertilizer. Eggshell powder and thoroughly decomposed fishy water are very good phosphorus fertilizers, while bran ash and tobacco ash are readily available potassium fertilizers. A compound fertilizer of nitrogen, phosphorus, and potassium can also be applied to promote the sprouting of more new plants and leaves. Fertilization must be moderate, and it is absolutely important not to apply concentrated fertilizer or raw fertilizer that has not been fermented and decomposed, otherwise it easily causes scorched or rotting leaf tips. In winter, if new leaves show spots and the root system turns yellow, it indicates excessive fertilization, while new leaves that are narrow, thin, and especially pale indicate a lack of fertilizer.
2. Watering. The soil should not be too dry or too wet. Each watering must soak through, and after flower buds appear, a little more water should be given. About every 20 days, combine watering with applying fermented soybean cake water, diluted fishy water, and water chestnut water, etc., combining watering and fertilizing. When room temperature is low, watering should be controlled to prevent the potting soil from becoming too wet. Too-wet potting soil can cause root rot and death, but the potting soil should not be allowed to become too dry either.
3. Heat preservation. The suitable temperature for Clivia miniata in winter is 15°C-20°C, and it is best not to go below 10°C. After the flower stem bolts, the temperature should be kept at around 18°C, and the day-night temperature difference is best around 10°C, otherwise the flower stem will bloom before reaching the proper height, and "stem clamping" is likely to form. Therefore, when the outdoor temperature at night is below 10°C, it should be moved indoors. When the indoor temperature is below 10°C, in addition to covering the surface of the potting soil with a 1 cm thick layer of charcoal powder for insulation, it should also be placed in a sunny and warm spot indoors. When the indoor temperature is especially low, a film can be placed over the flower pot to raise the temperature, but the temperature inside the cover must not exceed 25°C. If it exceeds that, ventilation is needed to lower the temperature.
4. Adjusting light. Although Clivia miniata likes a semi-shaded environment, the longer the sunlight exposure in winter, the better. When blooming, strong light will shorten the flowering period, while weak light can extend it. It likes warmth and coolness, and dislikes severe cold and intense heat. Generally, it grows well at 18°C-20°C, stops growing below 5°C, and is not damaged above 0°C. After Clivia miniata is moved indoors, light is restricted, so the flower pot needs to be moved manually for adjustment. Under normal circumstances, it should be placed in a sunny spot indoors during the day so that it receives sunlight and maintains its original color. Before blooming, it should also be placed under a fluorescent lamp at night for supplementary indoor lighting. Because the two rows of leaves of Clivia miniata are opposite, if the light remains in one position for a long time, the leaves will grow unevenly, affecting the ornamental effect. For this reason, when adjusting light, attention should be paid to the direction of the leaves, and the side facing the sun should be changed about every 10 days. There are two ways to place the flower pot indoors: one is to place the leaves parallel to the sunny window, and the other is to place the leaves perpendicular to the sunny window. The latter is better than the former.
5. Measures to extend the flowering period. The flowering period of Clivia miniata is mostly from December to March of the following year. The method to extend the flowering period is to place it in a dark place when the flowers are about to open, appropriately control watering, and keep the temperature at 8°C-12°C. In this way, the flowering period can be extended by 10-20 days.