Answer: Hypericum grows well in average fertility. If it seems to be growing well then you may not need to fertilize. Ideally you would run some basic soil tests to see if you need to use fertilizer and how much. But you could use a general purpose or slow release granular fertilizer such as 10-10-10 or similar analyisis each spring, read and follow the label directions. You could also use a top dressing of good quality compost each spring. Using an organic mulch year round will also help feed the soil slowly as it breaks down over time. I hope this helps.
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