If you’ve driven past one of our new restoration sites this summer and seen a field bursting with cosmos, you might have some questions. Cosmos are annuals, not native to Michigan. But they play a specific role in how we approach a full-scale prairie restoration.

Why Cosmos Are Often Used at the Beginning of a Prairie Restoration

When we convert a mowed lawn or old pasture into native prairie, we often use a supplemental starter mix alongside the native prairie seed. That starter mix includes quick-establishing species like cosmos, tickseed, blanketflower, and partridge pea. These plants germinate fast and put on a big, colorful show in the very first year—long before the native prairie plants have done much visible growing at all. 

Most native prairie species spend their early life building extensive root systems underground rather than putting energy into height or flowers. A newly seeded prairie can look like bare dirt for months while all the real work happens below the surface. The starter mix fills that gap.

Native Prairie Restoration Is a Multi-Year Effort, Not a One-Season Transformation

Cosmos and their companions aren’t here to stay—they won’t be reseeded year after year. As native plants like coneflowers, coreopsis, asters, milkweeds, goldenrods, and a variety of grasses continue developing their root systems, they gradually take over, filling in the space the early annuals once occupied. Over a few growing seasons, the balance shifts: the short-lived, early-establishing species fade out, and the longer-lived native community becomes the backbone of the prairie.

By year three or four, a well-established site looks completely different from that first-year. The result is a landscape that is structurally diverse, more resilient, and built to support pollinators and wildlife for decades rather than a single season.