Blackberry Lily ( Iris domestica ), previously known as Belamcanda chinensis, is a perennial valued for its distinctive flowers and ornamental seed pods. These pods offer visual interest even after the blooms fade, contributing to the plant’s prolonged garden appeal.
Identifying Blackberry Lily Seed Pods
Blackberry Lily seed pods appear after the plant’s vibrant flowers fade, typically in mid to late summer. Initially pear-shaped and green on slender stems, they transform into a dry, papery tan or brown by late summer and early fall.
Maturity is indicated when the pods split open, revealing a cluster of shiny, round, black seeds. These seeds strikingly resemble a blackberry, giving the plant its common name. Mature pods often rattle when shaken, signaling the seeds are hardened and ready. They remain attached to the stalks for several weeks, offering continued ornamental value.
Harvesting and Storing Blackberry Lily Seeds
Harvest Blackberry Lily seeds in late summer to early fall, once the pods have dried, become papery, and begun to split open. The seeds should be visibly black, firm, and rattle within the pod. Collect by carefully plucking individual seeds from opened pods, or for a larger harvest, cut the entire flower stalk before the pods disperse their contents.
After collection, clean the seeds by removing any papery bits or plant debris. Though they lack a fleshy outer coat, ensure they are free from moisture. Spread the cleaned seeds in a single layer on a paper plate or screen in a dry, well-ventilated area for several days. This drying prevents mold during storage. Once completely dry, store the seeds in an airtight container or paper envelope in a cool, dark, dry location, such as a refrigerator, to maintain viability.
Propagating Blackberry Lilies from Seed
Propagating Blackberry Lilies from seed is rewarding but requires patience, as plants may take two to three years to flower. Cold stratification is essential for successful germination, mimicking natural winter conditions. This can be done by sowing seeds outdoors in the fall or late winter, allowing cold temperatures to break dormancy.
For indoor propagation, artificial cold stratification is recommended. Place dried seeds in a small plastic bag with a slightly moistened medium, such as peat moss or a paper towel. Seal the bag and refrigerate for 4 to 8 weeks. After stratification, sow seeds indoors 8 to 12 weeks before the last expected frost. Plant them 1/4 to 1/2 inch deep in a well-draining seed-starting mix. Maintain consistent soil moisture and provide ample light, ideally from a sunny window or under grow lights. Once seedlings develop a few sets of true leaves and frost danger has passed, gradually harden them off. Then, transplant them outdoors into a sunny location with well-drained soil, spaced 6 to 10 inches apart.