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Ageratum can tolerate full sun or partial shade, but in areas where the summers are hot and long, it is best to plant them in light shade.
These plants will grow just fine in a soil of average fertility, but they do best if there is a lot of organic matter in the soil. The organic mater helps improve drainage and ageratums don't like being too damp. For these plants, a pH of between five and six is ideal.