On Apr 20, 4:08*pm, Paul Luton wrote:
Many moons ago when my garden was a top floor window box this plant
flowered all summer and survived the winter. Now with the luxury of a
rock garden I have to replant every year. A month ago the plant was
green at the base so I hoped that it might have survived but alas no.
Does anyone have more luck/skill ?

Paul in Teddington -SW London.

It is a plant I have grown for years, not all that long lived I've
found, but if you layer some stems each year and add a bit of compost
to the centre then I've found you can keep it for years.
Good luck with the next one.