My milkweed has been almost bare for a long time now that the monarchs
have been laying eggs and the caterpillars have devoured them. I kept
thinking the leaves would grow back, but they haven't, expect for a
few new leaves at the top. The rest of the stalks remain bare.
Meanwhile the monarchs keep leaving more eggs on the what few leaves
are there.

I didn't think I was suppose to cut them back to encourage growth,
but am I wrong? They've been bare for many many months. Now I have
lots of new baby caterpillars and they're going to run out of food.

Also I started some new seed plants and cuttings that I rooted, that
I'm having trouble with. After fighting off the aphids, now there
seems to be something turning the leaves whitish and leaving some sort
of spider web looking stuff on them and they are dying. I didn't want
to spray anything toxic since I'm growing them for the butterflies and
caterpillars. Any suggestions on what I can do?