Purple Loosestrife

Purple Loosestrife, Lythrum salicaria.  Ray's Pond, Jubilee Country Park, 31 July 2011.

This plant makes a great display by the side of large ponds or lakes. It's a bit big for a small garden, but this specimen, planted at the edge of a fairly new pond in Jubilee Country Park, does very well. You can see some beside the lake in the lower photo in this post on Sevenoaks Wildlife Reserve.