Question
What are the green like caterpillars on my impatients.  I never had them before.  They are eating all the green leaves.  I don't see any legs.

Answer
Mary,
The good news is that there is a product that is a great organic treatment for caterpillars - go to your garden center and ask for a product with Spinosad in it.  This is similar to Bt but is effective on a wider range of caterpillars and larvae.  It comes under several brand names and is very effective.
Use it according to directions, but spray in the evening when bees aren't around - once Spinosad is dry it doesn't hurt bees, but if you get it on them wet it can make them confused.

I hope this helps,
C.L.