My Dierrama which is about 5 years old, was flowering very well until last year, when it had fewer flowers than usual. This year there were a lot of dead leaves , most of which I pulled. It now looks rather scrawny, and one third its former size. It is planted in clay soil, facing south west, and this area gets very dry in summer. Would extra watering and feeding improve the plant, or should I buy a new one? I hope you can advise me.
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