To propagate Siberian Squill (Scilla siberica), the most common method is to divide the bulbs (offsets) in the fall after the foliage dies back when the plant is dormant, simply dig up the clump, separate the smaller bulbs, and replant them in a new location; you can also propagate by seed, but this method is less reliable and may take longer to establish.
Key points about propagating Siberian Squill:
Best time to divide: Late summer or early fall, after the foliage has died down.
How to divide: Carefully dig up the bulb clump, gently separate the smaller offsets from the main bulb, and replant the offsets in a new area.
Seed propagation: Collect seeds when they are ripe, sow them in a cold frame, and keep the soil moist.
Naturalizing: Siberian Squill readily naturalizes on its own by spreading seeds, so you can also let it spread naturally to new areas in your garden.