I am a Dendrobium, a vast and diverse genus of orchids. Many of my most common varieties in the USA, like the Den-phal (Dendrobium phalaenopsis), originate from the warm, humid climates of Southeast Asia and Australia. This means I thrive in conditions that mimic my homeland. I prefer bright, indirect light. Think of the dappled sunlight filtering through the canopy of a tree. A south or east-facing window is ideal. Too much direct sun will scorch my leaves, turning them yellow, while too little will prevent me from flowering.
My watering needs are specific and change with the seasons. During my active growth period in spring and summer, I am quite thirsty. Water me thoroughly once a week, allowing water to run freely from the drainage holes. It is crucial that I am never left sitting in water, as my roots will quickly rot. Before watering again, my potting medium should be nearly dry. I also enjoy higher humidity, around 50-60%, which can be provided by a humidifier or a pebble tray. Feed me with a balanced, water-soluble orchid fertilizer (20-20-20) diluted to half-strength every other week during growth periods.
Understanding my natural cycle is the key to making me bloom. After my flowers fade in late fall or early winter, I enter a rest period. This dormancy is triggered by cooler temperatures and reduced water. During this time, you should reduce watering significantly, perhaps to just a light misting every few weeks to prevent my canes from shriveling excessively. Hold all fertilizer. I also need a distinct drop in nighttime temperatures, around 55-60°F (13-15°C), for several weeks to initiate new flower spikes. Without this cooler, drier rest, I may grow plenty of green leaves but will likely not bloom.
I typically grow as an epiphyte, meaning I naturally anchor myself to trees in the wild. Therefore, I require a very well-aerated and fast-draining potting medium. A mix of orchid bark, perlite, and sphagnum moss is perfect. I only need repotting every 2-3 years when my potting medium breaks down or when I have completely outgrown my pot. This is also how I propagate. When you repot me, you can divide my clump, ensuring each new section has at least 3-4 healthy canes and a good root system. I also produce baby plants, called "keikis," on my canes, which can be removed and potted once they develop roots several inches long.
