In article ,
Sacha wrote:

Wherever you plant them they will either flourish or die or migrate to a
place in which they are happy. The latter seems to be not full sun and
gravel. I love them to bits and have never, ever managed to grow them.
I've planted and struggled with the white and the pink ones and every single
time they have died on me. But several friends of mine who have planted
them tidily in flower beds have found that they have moved themselves in a
very determined fashion to gravel paths and are just about swamping them!
I don't agree with those who suggest damp areas for planting but that's just
my personal experience of them.

Possibly. A damp area on 60% sand in Cambridge is probably equivalent
to a dry area where you are :-)

And the lack of leaf competition could be right, though mine invade
some pretty dense plants. They have never invaded the lawn.


Regards,
Nick Maclaren.