I've had my plants for a couple of months, and they simply continue to shrivel up and shed leaves. I know they're cacti and succulents, so the shouldn't need much water, but when I see this I give them more water, and this still goes on. Now the succulent that seemed hardier is drooping, and I've started watering weekly. I've even noticed some type of white powder around the pot. Help?
( They are kept inside, next to, but not directly in front of, a north facing window-- I'm in an apt.)
Thanks