Dendrobium orchids have very special care requirements. Avoid these mistakes and you can count on abundant flowering.
Orchids of the genus Dendrobium are very popular. We mainly sell hybrids of Dendrobium nobile: With good care, the plants adorn themselves with 10 to 50 fragrant flowers. In its Asian homeland, the species grows epiphytically as an epiphyte – it can store water and nutrients in its pseudobulbs, the thickened shoot parts. Its characteristic trunk is reminiscent of bamboo – the plant is therefore also called “Bamboo Orchid”. It is quite normal for dendrobium to produce only 10 to 15 flowers after a record bloom. After a while, they can bloom again abundantly – provided they are properly cared for.
Error 1: Do not keep a rest phase
Dendrobium orchids need cooler temperatures for several weeks to form flowers. If you stand in a warm room all year round, hardly any new flowers will appear. During the rest phase from autumn to spring, daytime temperatures between 15 and 17 degrees Celsius are ideal, while at night around ten degrees Celsius is sufficient. In the growth phase from spring to autumn – when new bulbs are ripening – the orchids are kept warmer: during the day temperatures can be 20 to 25 degrees Celsius, at night a temperature of around 15 degrees Celsius is favorable. The best way to achieve this drop in temperature at night is to put the plants outside in the summer. Choose a place that is protected from rain and direct sunlight. In general, the Dendrobium orchids love a bright, shady location – they also need a lot of light during the rest period.
Dendrobium nobile ‘Star Class Akatsuki’ enchants in purple and yellow. During the flowering period, which is usually between spring and summer, the plant likes to be warm
Note: If you keep the Dendrobium orchid for several weeks at around ten degrees Celsius twice a year, you can even expect two flowering times a year. If the temperature is too warm, the orchids will sprout adventitious plants instead of flowers.
Mistake 2: not adjusting the pour
Correct watering of the orchids is also important for healthy growth and flower formation. How much water the dendrobium orchid needs depends on its respective phase: While it is growing – or rather, dipping it – you pour it abundantly, but let the substrate dry off now and then. Because not only drying out, waterlogging also damages the plants: if there is too much water, the roots rot.
As a rule of thumb, the lower the temperature, the less water. Dendrobium lovers recommend stopping watering completely for six to eight weeks during the resting phase and after the new bulbs have matured. As soon as thickenings appear on the nodes, they reach for the watering can again. Fertilizing is also completely stopped during the rest period.
Error 3: ignoring humidity
If the air is too dry, which happens quickly during the heating season in winter, spider mites, as well as mealybugs and mealybugs, can appear on the orchids. To prevent pests, always ensure a high level of humidity. Regular spraying of the plants with low-lime, room-temperature water has proven itself. You can also use humidifiers and water-filled bowls to increase the humidity for the exotic beauties.