Saving Annual Flower Seeds: When to Harvest and How to Store

An Oklahoma gardener asked if seeds must be fully dry on the plant or can be picked green and matured off the stem.

Harvest Timing

Ideally, wait until the entire flower (petals and base) is dry—this ensures full maturity. However, you can harvest once the seed pod is swollen.

Drying & Storage

1. Remove pod, let seeds air-dry on paper towel for ≥3 days.
2. Store in zip-lock bag inside a sealed container.
3. Refrigerate (back of fridge) for ≥3 months. Cool, dry conditions simulate winter dormancy, improving germination.

This method works for most annuals. Label with name and date!