On 14/07/19 in his garden near Shaftesbury Dave tells us:
This was one of two Small Tortoiseshells egg laying on the nettle patch in the garden . The nettles are cut back from mid June to encourage the fresh growth that the females require . Also Commas and Red Admirals using the same nettle bed.
Whilst suitable flowers for nectaring butterflies are of course really necessary, plants in the garden for the caterpillars of butterflies and moths are of paramount importance, but so often not included.