In message , vsop
writes
Last summer I planted a small Lavatera (unknown variety) from the local
Wilko's store. It thrived very well and is now about 4 to 5 feet high.
It's in an exposed windy border.
It's been covered in pink blossom since last autumn (although the label
says it's spring flowered) and they and the foliage have only just been
damaged by the heavy frosts last week...... the foliage has not
dropped, just wilted.

My query.... how and when do I prune it ...... if at all ?

Advice would be much appreciated.

vsop.

What you may have is Lavatera x clementii 'Rosea', which starts
flowering in late June, and may continue until hit by frosts. 'Kew Rose'
is similar.

As already said, you can prune this hard. It might be worth you waiting
a month or so so you can see where new growth is breaking.
--
Stewart Robert Hinsley