Hello, in the last few years I've fallen in love with echinacea's and have bought them as plugs and bare roots. When I got the plugs it said they were short lived perennials and would need replacing in 3 years.
Would this just be these two varieties (sorry can't remember the names) or does that apply to all echinaceas?
Will i need to replace them every three years or is there a chance they will self seed ?
Any tips on how to keep them going in the garden. They've made such a difference to the garden this year I'd like to keep having them in there without having to buy more every three years. Thank you.