How to grow It is best to plant Yarrow seeds on the soil surface, 30 to 60 cm apart, in the early spring, as a frost is required or in the early autumn. Yarrow plants like light and should be grown in full sunlight. They are capable of growing in poor soil, but ideally should be planted in a loam at a pH of 5.5 to 7. Achillea requires light and between between 10 and 100 days for germination to occur at a temperature of 15 to 18 degrees Celsius. If growing the plant indoors it should be sown 10 weeks before planting out. It should be put outside in early spring or late autumn.
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