Thanks, Sacha. Ferns do well in this area, the hedgerows harbour them,
and there are several big clumps on the border of my soakaway-lawn
already. I know they erupt from big fleshy "pods" - with delicate roots
on the underside of these. I wonder if these hair-like roots WOULD
penetrate a few feet if they sensed the moisture beneath?

I like the idea of several groups of tree-ferns, in twos and threes of
different heights, with lots of more ordinary ferns inbetween and
scattered around. This would look less "unkempt" than a wildflower
lawn - which, anyway, I believe needs to be mown and maintained if the
wildflowers are not to be overtaken by the grasses. I had a go at
wildflower garden at another property, in West Wales, a couple of years
ago, and the first year it was beautiful. Despite cutting it as advised
in autumn, the next year it was predominantly buttercupt - magnificently
buttercups for several weeks in fact, and by the third year only one or
two individual wildflower plants had managed to stand the competition
from ranunculus and grasses!

Eddy.