I haven't planted any horticultural Lythrum cultivars, for ten years, in any of the perennial gardens I've planted and maintained and have also destroyed the L. salicaria 'Morden Pink' which I planted in one garden because it had apparently lost it's self-incompatability and had started to seed.

The plant pictured above is in a town garden away from any possible L. salicaria (with which it can apparently crossbreed). As a precaution, I also always deadhead the plant immediately after it flowers.

I also intend to remove all of the small number of Lythrum cultivars which I planted and maintain when I close down the gardens.