I agree completely with what Lin has stated. I make all my own custom mixes depending on the variety and when it comes to orchids, depending on variety and plant size. Some of my jade will get watering every week (and more often when it rains) and some might not get water for 2-3 weeks. Under-watering is far better than over-watering. Very well draining soil is the key here. When you get used to seeing healthy plants with plump leaves, you will be able to tell when the plant needs watering. The leaves will begin to shrivel slightly. You'll know the look immediately. The leaves will plump right back up within a couple of days.
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