"Charlie Pridham" wrote
snipped
I have always found the various powder type insecticides good for ants, but
I have never had them in a propagator! They must have thought it was
Christmas when you installed central heating for them :~)
Charlie, gardening in Cornwall.

I've had them in my potting-up table. This is outside and has a lid to keep the
rain of. They obviously thought it was heaven sent!!

I tipped them and the earth out onto the garden as I did not want to have to
touch them while potting up etc.

I do seem to feel that they undermine plants by tunnelling through the roots.

Jenny