Yarrow
Asteraceae family
Yarrow is a common relatively short perennial herb which produces one to several 8 to 40cm tall stems. The flowers are white or pinkish flowering in early summer to autumn.
Pros
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plant the seeds no more than 0.5 cm deep; they require light for germination
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germination temperature range is 18-25 degrees Celsius
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freely seeds
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likes soil that is poorly developed and well-drained.
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has a fibrous underground horizontal root
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very drought tolerant
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accumulates nutrients - its deep roots mine the subsoil for potassium, calcium, and magnesium, phosphorus and copper, making it a nutrient-rich mulch
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used in a mixed cover crop to build soil, mine minerals, break up compacted soil and attract beneficial insects
cons
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can become invasive
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gets mildew or root rot if not planted in well-drained soil