Dividing Unknown Perennials: Dig Whole, Split After Bloom

To divide mystery perennials, wait until after flowering ends and at least 30 days before first frost.

Method

1. Dig the entire clump.
2. If there's a half-cup of roots per division, it's viable.
3. Split with a sharp knife or spade into sections, each with roots and shoots.
4. Replant immediately at same depth. Water well.
5. Mulch 2″.

Timing by Zone

• Zone 5–6: Late August–September.
• Zone 7–8: September–October.

Fall division gives roots time to settle before winter.