Yarrow (Achillea spp)
The gorgeous flat-headed blooms of this plant are perfect for butterflies to land on to enjoy the sweet nectar. Yarrow has been a vital herb throughout history in many medicinal, cooking, and cosmetics endeavors, not just for butterfly gardens. It is a prolific seeder and can spread by creeping roots. The clumps can also be divided and replanted to maintain more control of the planting arrangements.
Yarrow will grow in most conditions and help gardens by adding calcium, silica, and phosphorus to the soil. Occasionally, mildew can affect Yarrow, but the aromatic feathery leaves with colorful blooms are a lovely addition to every garden.