Watering D. phalaenopsis requires a little more care than a typical houseplant. They should be watered year round, when the potting mix is dry all the way through. I personally prefer horticultural charcoal for dendrobiums, though you may have better luck with another type of potting media. Water soluble fertilizer should be used regularly, but allow at least one watering with plain water in between each fertilization.
Propagation of D. phalaenopsis can be somewhat difficult or very easy, depending on what your goal is. Plants can be easily divided when you re-pot them, though this should only be done as necessary to avoid extensive stress to the plant and trauma to the root system. The more difficult method would be propagation from seed. Orchid seeds contain no nutrition to help them get established and so must be sown on agar or something similar in sterile flasks. Orchids grown from seed take an incredible amount of time to get established and so that method is typically only done when trying to obtain a new variety.
The most common insect pests you'll encounter with Dendrobium phalenopsis are scale and mealy bugs. I like to deal with these using a horticultural oil, such as Volck Oil Spray. You may end up needing to wash the plant by hand if an infestation occurs, but regular observation of the plant and immediate removal of any unwanted guests is typically enough.
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