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Yarrow has been
valued since ancient times for its ability to stop bleeding, hence
its folk name "nosebleed." Today, yarrow is valued for its ability
to fight off colds and flu. It is also an ingredient in many herbal
cosmetics. Dried and cut flowers are used in arrangements.
Flowers heads are flat and 2" to 6" across on 2' to 5' stems. Colors include white, yellow, gold, pink and red. The aromatic foliage is green or gray.
Cultivation
Yarrow is an undemanding plant that thrives even in poor soil but does best in a sunny position with good drainage and light soil. Yarrow grows well in zones 3-8 with some cultivars extending to zone 10. Plants are susceptible to disease in humid areas.
Propagate from seeds, by root division or from woody cuttings taken in autumn or spring. They can take a year or two to establish themselves from seed. Place the plants 1-2 feet apart and divide the clumps when they become crowded. Taller cultivars may need to be staked, especially if grown in very fertile soil.
Disease
Mildew
Mildew is a fungal disease which causes
grayish downy spots on leaves. Plants which do not have adequate
sunshine or air circulation, or those grown in humid climates are
most susceptible. Spray with
sulfur
early in the morning while foliage is still slightly moist with
dew. Badly infected plants should be cut down and destroyed.
Do not use yarrow during pregnancy, for undiagnosed bleeding, or for more than two weeks.
Use flowers, leaves and stems.
A piece of the plant held against a wound will staunch bleeding.
An infusion can help to break a fever.
A tea made from yarrow with peppermint and elderflower can be used to fight colds and flu.
Yarrow can be of benefit in mild cystitis.
Promotes digestion.
Improves circulation by acting as a vasodilator.
Lowers blood pressure.
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