Reasons Why Cattleya Orchids Won't Bloom and the Latest Solutions
Cattleya orchids have flower shapes and colors in a thousand variations, dazzling and eye-catching, often appearing at celebrations and banquets, used for flower arrangements. If Cattleya and Phalaenopsis are used as the main materials, paired with Oncidium, Solomon's seal, and asparagus fern in a vase, they are bright and elegant, with a strong sense of rhythm. If Cattleya is the main flower, paired with Anthurium, baby's breath, Monstera adansonii, and bear grass, it appears light and lively. Cattleya is the most beloved epiphytic orchid. Its flowers are large and brightly colored, with strange and beautiful blooms, and extremely rich color variations, making it incredibly magnificent, earning it the reputation of "Queen of Orchids."
Cattleya has original species and hybrid species. It is one of the most famous orchids internationally, native to Brazil, and was originally used as binding material when first discovered, which is why its resistance is particularly strong. The pseudobulbs are club-shaped or cylindrical, with 1 to 3 leaves growing at the top; the leaves are thick and hard, with the midrib sunken; flowers are single or several, borne at the top of the pseudobulbs, large and beautiful, with bright and rich colors. Cattleya is native to tropical America and is the national flower of Brazil, Colombia, and other countries. There are more than several thousand varieties. Colors include white, yellow, green, red, and purple. Propagation is by division, tissue culture, or sterile sowing.
Cattleya prefers a warm and humid environment. In such an environment, the leaves and pseudobulbs are dark green, glossy, and full of vitality. Flower buds can develop smoothly, flowers bloom abundantly, and colors are vivid. New roots and young shoots grow vigorously. If the temperature is around 11°C, the flowering period is delayed, the flowers cannot fully open, and the flowering period is shorter.
If the temperature is around 5°C, the leaves turn yellow and appear lifeless, the pseudobulbs develop longitudinal wrinkles, the flower buds cannot grow or elongate, and the flower sheath turns brown, with growth severely hindered. If the temperature drops to 1 to 2°C, the leaves wither and yellow or turn brown and fall off, and the flower buds die. Of course, if the nighttime temperature is above 20°C, it often leads to an overly short flowering period. In greenhouse cultivation in the north, special attention should be paid to maintaining a large day-night temperature difference, making the daytime greenhouse temperature 5 to 10°C higher than at night. The temperature should not be equal day and night, and the nighttime temperature should certainly not be higher than the daytime temperature.
During the spring and autumn growing seasons for Cattleya, abundant water and relatively high air humidity are required. It should not be overly dry, otherwise growth will be affected. In winter, Cattleya almost stops growing. In greenhouses with poor ventilation, Cattleya should be moved to an outdoor shade house for a period of time, otherwise growth will be poor and rot diseases are also likely to occur.
Too strong light can cause severe sunburn or growth stagnation and yellowing of leaves. In winter inside the greenhouse, light can be reduced slightly or not shaded at all. Among orchids, Cattleya belongs to the light-loving types. If light is insufficient, it will bloom less, not bloom at all, or produce flowers of poor quality. The leaves become thin and soft, the pseudobulbs become slender, and the growth vigor weakens. In order to produce good flowers, the light can be slightly stronger, and even slightly yellow leaves will not affect the plant's growth. Growers who cultivate for flower production often adopt this cultivation method, and the flower yield increases significantly.
Cattleya stems and leaves are thick and fleshy, with vigorous aerial roots, and it is drought-tolerant; not watering for a month will not cause it to die. It can be cultivated on rooftops, balconies, under eaves, and under large trees, but it requires fresh, circulating air and appropriate shading. A shade net can be used to block 50% to 60% of sunlight. The daytime temperature should be 25°C to 30°C, and the nighttime temperature 15°C to 20°C. Small seedlings are best overwintered in a greenhouse in winter.
Reducing watering during the flowering period can promote flower bud differentiation; after new shoots or flower buds form, more watering is needed, but watering should be avoided at night, especially when a cold wave strikes, when watering must be stopped completely; under normal conditions, air humidity should be controlled at 60% to 65%. Cattleya can be planted in plastic pots or ceramic pots; for mature plants, the growing medium can use 6 parts crushed fern root and 1 part, plus charcoal and gravel, etc.
During the three vigorous growing seasons of spring, summer, and autumn for Cattleya, attention should be paid to placing some fermented solid fertilizer in different parts of the pot surface, once every 1 to 2 months, or applying liquid fertilizer once every 1 to 2 weeks. Small seedlings should be fertilized more frequently so they can grow faster.
When the plant's rhizome has grown beyond the edge of the pot, or the growing medium in the pot has begun to collapse and drainage is no longer smooth, it should be repotted promptly. This situation usually occurs after two years of cultivation. Repotting is best done in spring after the flowering period, when new roots have not yet grown.
Mature plants usually use larger pieces of growing medium than small seedlings; once the plant has grown at least six mature pseudobulbs, it can be moved to a larger pot without division. If you want to propagate by division, each pot should contain at least 3 to 5 pseudobulbs. The pot size should be such that it will not become full within roughly two years.