rajamari :

Geographical distribution:

Yarrow grows from sea level to 3,500 metres (11,500 ft) in elevation. The plant commonly flowers from May to July. Common yarrow is frequently found in the mildly disturbed soil of grasslands and open forests. Active growth occurs in the spring.

The plant is native to Eurasia and is found widely from the UK to China.

In North America, both native and introduced genotypes, and both diploid and polyploid plants are found. It is found in every habitat throughout California except the Colorado and Mojave Deserts.Common yarrow produces an average yield of 43,000 plants per acre, with a total dry weight of 10,500 lbs.

The plant is found in Australia as an introduction.

ECOLOGICAL ASPECT:

Birds

Several cavity-nesting birds, including the common starling, use yarrow to line their nests. Experiments conducted on the tree swallow, which does not use yarrow, suggest that adding yarrow to nests inhibits the growth of parasites