To propagate a foxtail lily (Eremurus), the most common method is by dividing established clumps in the fall after the foliage dies back, ensuring each division has healthy roots and a crown, and then replanting them separately; you can also try propagating from seed, but this can be more challenging and may not produce identical plants to the parent, requiring a cold stratification period for germination.
Key points about propagating foxtail lilies:
Division:
Best time: Late fall after the foliage dies down.
Process: Carefully dig up the plant, gently separate the smaller offsets with roots attached, and replant them spaced apart.
Important consideration: Be careful not to damage the brittle roots while dividing.
Seed propagation
Harvesting seeds: Collect seeds in autumn after flowering.
Germination: Sow seeds in a tray with compost, and expose them to a cold stratification period (like in a cold frame) to promote germination.
Challenges: Seed propagation can be unpredictable and may take a long time to establish.