Dividing Sedum ‘Autumn Joy’ and Hydrangeas: Timing, Root Ball Size, and Winter Mulch

Sedum ‘Autumn Joy’

• Divide now (fall) — dig, cut crown into pieces with golf-ball-sized root balls.
• Replant immediately; water well.
• Mulch with cypress chips or leaves.

Hydrangea

• Divide in fall or early spring.
• Need larger root ball — baseball-sized minimum.
• Ensure each division has stems and roots.
• Mulch heavily.

Key Rule

Get divisions in ground before hard freeze. Root establishment in cool soil = spring vigor.