Posted: 06/09/2014 at 00:18
Rudbekias are hardier than echinaceas and less temperamental.
I grow a lot of the newer .......and more difficult varieties.....and they really do need to develop as big a root system as possible before flowering. They are problematic in winter too, some times (paradoxically) because they are too warm and cosseted .
Cangrandmafixit, what varieties do ??ou have? The older varieties are less of a problem. Those varieties can be left in the ground Down here ...in Cornwall....in my soil (light Sandy) they survive well enough. However, I,will dig up some of the modern ones and keep in greenhouse.
If you have young plants they are best kept indoors......they beat both the winter and the slugs then