Yarrow will grow in your shittiest soil, survive your driest summer, and feed more pollinators than most plants you actually tried to grow. Yarrow blooms from late spring through fall, making it one of the longest pollinator windows of any garden plant. Miner bees, mason bees, bumblebees, leafcutter bees, sweat bees, checkered beetles, and butterflies all use it. It builds soil as it grows, tolerates drought, and spreads gradually without being aggressive. It comes back every year without replanting, expensive fertilizer, or much water once it's established. One note worth knowing: many yarrow plants sold at big box garden centers are European ecotypes or colorful cultivars, not true North American natives. For maximum wildlife value, look for Achillea millefolium from a native plant nursery in your region. Plant it in a sunny spot with decent drainage. Come back in summer and count how many things are using it.