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{{SPlantbox
{{SPlantbox
|familia=Asteraceae
|genus=Achillea
|genus=Achillea
|species=millefolium
|species=millefolium
|taxo_author=L.
|taxo_author=L.
|common_name=Yarrow
|common_name=Yarrow, Milfoil
|name_ref=Flora - A Gardener's Encyclopedia
|habit=herbaceous
|habit=herbaceous
|habit_ref=Wikipedia
|habit_ref=Wikipedia
|Max ht metric=m
|Max ht metric=m
|height_ref=Wikipedia
|height_ref=Wikipedia
|Min wd box=.45
|Min wd metric=m
|Max wd box=.75
|Max wd metric=m
|width_ref=Flora - A Gardener's Encyclopedia
|poisonous=rare skin allergies
|poisonous=rare skin allergies
|poison_ref=Wikipedia
|poison_ref=Wikipedia
|water=moderate, dry
|water=moderate, dry
|features=flowers, fragrance, naturalizes, invasive, bees, drought tolerant
|features=flowers, fragrance, naturalizes, invasive, bees, drought tolerant
|flower_season=early summer, mid summer, late summer
|flower_ref=Flora - A Gardener's Encyclopedia
|flowers=red, yellow, white
|flowers=red, yellow, white
|Min Temp Num=-25
|Min Temp Num=-25
|Temp Metric=°C
|Temp Metric=°C
|temp_ref=Plants for a Future
|temp_ref=Plants for a Future
|min_zone=3
|usda_ref=Flora - A Gardener's Encyclopedia
|max_zone=10
|image=Achillea millefolium 20041012 2574.jpg
|image=Achillea millefolium 20041012 2574.jpg
|image_width=200
|image_width=200
'''Yarrow''' ('''Common Yarrow''', '''Gordaldo''', '''Nosebleed plant''', '''Old Man's Pepper''', '''Sanguinary''', '''Soldier's Woundwort''', '''Thousand-leaf''', '''Thousand-seal'''; '''''Achillea millefolium''''') is a [[flowering plant]] in the family [[Asteraceae]], native to the [[Northern Hemisphere]].
'''Yarrow''' ('''Common Yarrow''', '''Gordaldo''', '''Nosebleed plant''', '''Old Man's Pepper''', '''Sanguinary''', '''Soldier's Woundwort''', '''Thousand-leaf''', '''Thousand-seal'''; '''''Achillea millefolium''''') is a [[flowering plant]] in the family [[Asteraceae]], native to the [[Northern Hemisphere]].
Common yarrow is an erect [[herbaceous]] [[perennial plant]] that produces one to several stems (0.2 to 1m tall) and has a [[rhizomatous]] growth form. Leaves are evenly distributed along the stem, with the leaves near the middle and bottom of the stem being the largest. The leaves have varying degrees of hairiness (pubescence). The [[leaf|leaves]] are 5–20 cm long, [[pinnate|bipinnate or tripinnate]], almost feathery, and arranged spirally on the stems. The leaves are [[cauline]] and more or less clasping. The inflorescence has 4 to 9 [[bract|phyllaries]] and contains ray and disk flowers which are white to pink. There are generally 3 to 8 ray flowers that are ovate to round. Disk flowers range from 15 to 40. The inflorescence is produced in a flat-topped cluster. Yarrow grows up to 3500m above sea level. The plant commonly flowers from May through June, and is a frequent component in [[butterfly garden]]s. Common yarrow is frequently found in the mildly disturbed soil of grasslands and open forests. Active growth occurs in the spring.
Common yarrow is an erect [[herbaceous]] [[perennial plant]] that produces one to several stems (0.2 to 1m tall) and has a [[rhizomatous]] growth form. Leaves are evenly distributed along the stem, with the leaves near the middle and bottom of the stem being the largest. The leaves have varying degrees of hairiness (pubescence). The [[leaf|leaves]] are 5–20 cm long, [[pinnate|bipinnate or tripinnate]], almost feathery, and arranged spirally on the stems. The leaves are [[cauline]] and more or less clasping. The inflorescence has 4 to 9 [[bract|phyllaries]] and contains ray and disk flowers which are white to pink. There are generally 3 to 8 ray flowers that are ovate to round. Disk flowers range from 15 to 40. The inflorescence is produced in a flat-topped cluster. Yarrow grows up to 3500m above sea level. The plant commonly flowers from May through June, and is a frequent component in [[butterfly garden]]s. Common yarrow is frequently found in the mildly disturbed soil of grasslands and open forests. Active growth occurs in the spring.
Common yarrow is a drought tolerant species of which there are several different ornamental cultivars. Seeds require light for germination, so optimal germination occurs when planted no deeper than ¼ inch. Seeds also require a germination temperature of {{convert|18|-|24|C|F}}. Common yarrow responds best to soil that is poorly developed and well drained. The plant has a relatively short life, but may be prolonged by dividing the plant every other year, and planting 12 to 18 inches apart. Common yarrow is a weedy species and can become invasive.<ref>USDA, NRCS. 2006. The PLANTS Database (http://plants.usda.gov, 22 May 2006). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.[http://plants.usda.gov/java/profile?symbol=ACMI2]</ref> It may suffer from mildew or root rot if not planted in well-drained soil.
Common yarrow is a drought tolerant species of which there are several different ornamental cultivars. Seeds require light for germination, so optimal germination occurs when planted no deeper than ¼ inch. Seeds also require a germination temperature of {{convert|18|-|24|C|F}}. Common yarrow responds best to soil that is poorly developed and well drained. The plant has a relatively short life, but may be prolonged by dividing the plant every other year, and planting 12 to 18 inches apart. Common yarrow is a weedy species and can become invasive.<ref>USDA, NRCS. 2006. The PLANTS Database (http://plants.usda.gov, 22 May 2006). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.[http://plants.usda.gov/java/profile?symbol=ACMI2]</ref> It may suffer from mildew or root rot if not planted in well-drained soil.
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