Answer: Agapanthus thrives in full to partial sun exposure, in loamy soil. But, it's adaptable enough to grow well in heavy clay soil, as well. Once established, agapanthus can get along with only occasional watering so perhaps you're overwatering your plants. You might want to dig one plant up and inspect the roots and the soil around them. If the soil doesn't drain quickly, don't water so often. If it drains fast, you can pour on the water while the plants are blooming, then withhold water when they're not.
Hope your agapanthus perks up soon!
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