Growing Irises from Seed: A Step-by-Step Guide to Stratification and Sowing

Collecting and Preparing Iris Seeds

German bearded irises (Iris germanica) occasionally produce seed pods after cross-pollination. Seedlings won't come true to the parent but offer exciting variation.

Harvest and Stratification

1. Allow pods to dry and turn brown on the plant.
2. Bag pods with nylon or cheesecloth to catch seeds when they split.
3. Stratify: place seeds in a moist paper towel inside a sealed plastic bag; refrigerate 90 days (simulates winter).

Sowing and Growing On

1. After stratification, sow seeds ½ inch deep in a seed flat.
2. Maintain 70–75°F; germination in 2–4 weeks.
3. Seedlings resemble grass initially.
4. Transplant to individual pots when handleable.
5. Harden off after last frost: 10 days in shaded, protected spot.
6. Plant in a sunny, weed-free nursery bed.

Timeline to Bloom

Expect first flowers in the 2nd or 3rd year. Patience rewards you with unique, homegrown iris varieties.