Yarrow is an aggressive grower and typically doesn't require much help to propagate, spreading by self-seeding and rhizomes into substantial colonies if left unchecked, according to the Missouri Botanical Garden.

How do you get seeds from yarrow?

The easiest way is to collect seed from yarrow is to place a brown paper bag over the seed head and secure it lower down on the stalk with a piece of twine. Snap the stalk off with the seed head inside and leave it in a dry place for a week or two to make sure the seeds have completely dried out.

Does yarrow come back every year?

The yarrow plant (Achillea millefolium) is an herbaceous flowering perennial. Whether you decide to grow yarrow in your flower beds or in your herb garden, it's still a lovely addition to your yard. Yarrow care is so easy that the plant is virtually care-free.