100+ Yarrow Seeds (Achillea millefolium) Medicina Herbl Organic, Heirloom. Duration: Perennial Habit: Herb Leaf Shape: Lanceolate Inflorescence: Head Size Notes: Up to about 3 feet tall. Bloom Time: Apr , May , Jun , Jul , Aug , Sep Bloom Notes: Flowering late Apr to early Jul Water Use: Medium Light Requirement: Sun , Part Shade Soil Moisture: Dry CaCO3 Tolerance: Medium Drought Tolerance: High Applied to the skin, yarrow may soothe eczema, reduce inflammation, fight bacteria, and heal wounds. The plant is rich in antioxidants and may help with diabetes, heart disease, anxiety, IBS, and cramps. More research on its potential health benefits is, however, required Applied to the skin, yarrow may soothe eczema, reduce inflammation, fight bacteria, and heal wounds. The plant is rich in antioxidants and may help with diabetes, heart disease, anxiety, IBS, and cramps. More research on its potential health benefits is, however, requiredYarrow promotes a sedative activity on the nervous system, and is often employed as an anti-spasmodic for nervous dyspepsia.