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TREES WEED CONTROL
Weed Control •Total •Selective •Aquatic
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Languard Vegetation Management
T: 01858 880898 E:
info@languard.co.uk Safeguarding the Environment
By MIKE SEATON, Director, Weed Free
YARROW is native in meadows and pasture, banks, hedgerows and waysides. It is very common in Britain, especially on sports fields and heathland golf courses.
Aquatic Management Aeration Systems
• WILL REDUCE AQUATIC WEEDS and ALGAE • WILL PROVIDE YOU WITH CLEANER WATER • WILL IMPROVE YOUR FISHING
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Yarrow is a persistent weed of grassy banks and roadsides but not waterlogged areas. It is found on soils between pH 4.7 and 8.0. It has roots that penetrate to 20 cm deep and can withstand drought, even thriving on a poor dry soil.
Yarrow is considered to be an indicator of loam. It prefers an open habitat and is a natural component of chalk grassland but is absent from woodland. It is recorded living up to 3,980ft in Britain.
In the Middle Ages, Yarrow was part of a herbal mixture known as gruit used in the flavouring of beer prior to the use of hops.
Old folk names for Yarrow include Arrowroot, Bad Man’s Plaything, Carpenter’s Weed, Death Flower, Devil’s Nettle, Hundred Leaved Grass, Nosebleed, Old Man’s Mustard and Seven Year’s Love!
The English name Yarrow comes from the Saxon and Dutch words ‘Gearwe’ and ‘Yerw’ respectively. It has also been used as a food and was very popular as a vegetable in the 17th century. The younger leaves are said to be a pleasant leaf vegetable when cooked as spinach, or in a soup. It has a sweet flavour with a slightly bitter aftertaste. Yarrow has many herbal uses but can cause skin irritation and rashes.
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PHYSICAL APPEARANCE: Creeping, broadleaf type. The creeping stems produce finely divided, dark-green, fern-like leaves on short stems. Erect stalks produce flat-topped clusters of strongly scented white or pink flowers from June to August.
SITUATION: Yarrow grows on all soils, but thrives on dry, undernourished or slightly acid conditions. It is sold in garden centres for herbaceous borders for a few pounds a pot!
GROWTH: Yarrow is not thought to form a persistent seed bank although seed remains viable for at least five years in cultivated soil. In undisturbed soil, the depth of burial is an important factor in seed persistence. Seed viability in dry storage was around 30% after 10 years. Yarrow seeds may be dispersed by wind.
Seed has been found in horse droppings, and seedlings have been raised from the excreta of various birds. In pasture the shallow rhizomes simply spread out from the parent plant at 7-20 cm per year. On cultivated land the rhizomes are easily broken up by tillage operations and the fragments spread around. Regeneration can occur from single node fragments but the shorter the fragments the greater the mortality with depth of burial. Fragments 4 cm long fail to emerge from below 15 cm.
FLOWERS: Yarrow flowers from June to October. The flowers are insect pollinated and self- incompatible. Plants may need
Weed of the month YARROW (Achillea millefolium)
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