Erigeron karvinskianus - "Grow in fertile, well-drained soil that does not dry out in summer"
I really don't understand instructions like this from the RHS and others. Erigeron grow in the cracks in paths, in concrete and in walls. Why would they not want to grow like full sun Mediterranean conditions like rosemary or lavender - very gritty, very well drained, soil with a base of builders' rubble?
I do know that my daisy plants, small above ground (currently in pots with very sandy, gritty soil) have an enormous root system, filling a medium sized pot in a season. Checking yesterday, the pot is all root and hardly any soil. Is it a really a bog plant that got lost? I know we have to learn as we go, and take instructions with a bag of salt, but I read a lot of sites that give polar opposite instructions. #confused
The plant grows everywhere in Cornwall, always out of cracks in walls, especially high up on castle walls.