I have made hundreds nay thousands of plants from this particular perennial favourite. I don't even know which or where the original plant is. It's a bit like grandad's axe: it's had seven new handles and 6 new new heads. But it's still my grandad's axe!
This plant doesn't mind damp ground or even the edge of a pond. I have grown it from cuttings and divide it up Spring and Autumn and even in Summer when it's a wet one like this weekend is supposed to be. I call it my 'garden buttercup'.
Loosestrife was tied to Oxen's necks to deter insects like flies and other biting insects when ploughing and working in the fields. It could also be burned in the smallholding dwelling to eradicate house flies.
Like most plants it's got herbal uses. Herbal ointments can be made from the perennial.
The best thing about perennials is they come back every year and you are mad at dividing them like me. You will have lots of new plants.