Nettles for butterflies
We have a large clump of stinging nettles in one corner of the garden, which we leave for wildlife, and eventually chuck into the compost heap. This month we've had a sudden influx of small tortoiseshell butterflies (seven flew out of our oregano bed when I walked past it this morning) and I wondered if they'd hatched nearby.
Then I found two little bundles of caterpillars attached to nettle plants (there may be others). They look like the caterpillars of smal tortoiseshells, so it seems that it's been worth leaving the nettles, as this is where they breed.