Aphids love them, too. But misting with dishsoap water (especially under the leaves) seems to have taken care of most of them.

As for watering, from what I've read I'm under the impression they like to be moist (like all plants), but they actually prefer to be on the dryer side than the wet side. I've been watering every few days -- some water once a week. I'll just have to see how it goes, and learn for next year.