Congratulations on a beautiful orchid. From the spike at the tip of the cane, your den appears to be the type that does not need a dry, cold winter rest. It will want to be watered and fertilized regularly year round, although in the dark winter months not as heavily as in the warm sunny weather when it's growing its best. It wants more light than a phal, but not quite as much as a cattleya. It will grow well in a south or west window, although you haven't said what part of the country you live in, and culture can differ slightly. These plants are good growers and very forgiving.
About that yellow leave, slip the plant out of its pot and check the roots. Dens like to be watered and allowed to dry before being watered again. If the roots look mushy and are too wet back off of the watering and let the roots dry out, and try to up the light a bit.
Last edited by Alice-NJ; 11-27-2009 at 04:21 PM.
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