Downtoearthdigs
Answered on July 12, 2019
The yarrow plant tends to flop or fall over, especially if it gets too tall and spindly. You may need to stake such plants as they grow. Bury one end of the stake 1-2 inches away from the base of the plant, then tie the middle of the plant's stem to the stake with string or twine.
https://www.gardeningknowhow.com/edible/herbs/yarrow/growing-yarrow.htm
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