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They require little attention. Most prefer
neutral to alkaline soil and many will thrive
in quite stony ground, though clay may prove
difficult (isn't it always?). Some have
autumn leaf colouring (e.g. the
psilostemons)
while a few are evergreen (e.g. G. renardii).
Many of the more tender species will thrive
in sheltered positions in southern gardens,
(e.g. G maderense and G canarense but there
are plenty of hardy varieties for northern
gardeners. While some enjoy a sunny position
(G dalmaticum, G tuberosum, Kashmire White
and Kashmire Purple for instance) many are
lovers of full or partial shade making them
useful for planting under trees or north-facing
walls. Many form large clumps which are
easily split, and some such as G. versicolour
and G. maderense will seed freely, sometimes
producing new varieties.
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