is this plant a perennial or bi annual? I'm not sure whether to leave it as it is and cut to a few inches in spring or am I better of shaking the seeds out in new areas and pulling the old plants out like I do with mysotis? Thanks
L.coronaria can sometimes be biennial or a short-lived perennial (!) ; (a slight paradox there) ; very hardy in a free draining soil , and can seed around profusely .
In gardens I manage , I tend to remove the older tatty looking clumps and leave or transplant the self-set seedlings , purely to maintain their presence and to have a healthy colony of new plants every year or so .
They are lovely I would not be without mine . They seed all over her place but are very easy to pull up. The magenta flowers seem to shine in the sun. I think they are probably biennial but they need tidying up regularly. A cheap as chips plant that really does its job.
Thankyou PaulB3 and Iamweedy for your replies. Very helpful. I think I will remove the old stuff and bank on new plantlets that I can move around. Thanks again.