I have a number of rock roses, that are now large clumps and flowering
prolifically. The flowers are starting to die off, now normally I would
dead head them but this is impossible because of the quantity of
flowers. Two years ago I pruned one of the plants back the result was an
awful looking plant, though it did recover to give a good show this
year. How should I treat them? Also are they easy to propagate, as they
must surely after three years becoming to the end of their life cycle?
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Residing on low ground in North Staffordshire