Prairie Coreopsis (Coreopsis palmata)

Seed Collection Time:

Late summer to early fall — typically August through October.

Signs seeds are ready:

• Flower heads dry out and turn dark brown, and the central disc becomes brittle.

• Seeds (technically achenes) are flat, dry, and dark-colored, with a wedge or paddle shape.

• Seeds detach easily when rubbed between fingers or shaken over a container.

Seed collection steps:

1. Wait until flower heads are fully dry and seeds are loose, but collect before wind disperses them.

2. Snip entire dry seed heads into a paper bag.

3. Let dry for a few more days if needed, then rub or shake heads to release seeds.

4. Screen or sift to separate the seeds from chaff.

Germination tip:

• Benefits from cold-moist stratification for 30–60 days, but may also germinate without it.

• C(30–60): For more consistent germination, refrigerate in moist medium or sow in fall.

• Lightly cover seeds when sowing — they need some light to germinate.