Luxury Flat to Let (One Room to Share) with Built-In Restaurant

I have posted before on the plague of caterpillars which are devouring almost every plant I've got this year. I'm having to pick them off daily and am still not winning. But as I'm not into killing things, they all go into the caterpillarium.

The caterpillarium started when my son was small and I wanted him to see how caterpillars turned into butterflies. It's an old toy box partly filled with soil into which go various "extra" seedlings which I'd otherwise have thrown away, plus any plant which is too far gone to save - this year there have been a lot of the latter. In go the caterpillars, which then chomp away, pupate, hatch - and lay their eggs on my plants once more. So we start all over again.

I had to redo the whole thing today as everything had been eaten by previous generations. On the menu we have : spider plant, antirrhinums, alyssum, hollyhock and various other bits and pieces. Needless to say, I make sure to put in the plants that they seem to attack most in order to encourage them to stay put. Now if only I could find a way of directing the butterflies straight there ...