[Ozric Jonathan]

There is a new generation of LED indoors growlights which don't produce much heat but provide suitable spectrum of light. There would a risk of drying out but I think this could work well if an eye was kept on it.

But this would be an expensive way to produce some weeds! Ribwort plantain and some other weeds can be found in limited amounts most of the year so if you've only got a small tortoise the amount you have to find is really small.

I do like the idea of growing some plants under very controlled conditions and using a calcium rich but low nutrient growing medium. But I think that's for after I've stopped working.