Overwintering Potted Arborvitae in Massachusetts: Pot Material Matters

Arborvitae in containers add structure to poolside landscapes, but New England winters demand the right pots—or a protected location.

The Critical Factor: Pot Material

• Clay/terracotta/concrete: Porous walls absorb water → freeze → expand → crack. Roots freeze solid. Must move indoors (unheated garage, shed) or bury pots in ground.
• Insulated resin/fiberglass (double-walled): Air gap buffers root zone. Can stay outdoors if rated for your zone (Zone 5/6). Look for "frost-proof" labeling.
• Wood (cedar, oak): Moderate insulation; elevate on feet to prevent bottom rot. Often survive Zone 5 with mulch mound.

Outdoor Care for Hardy Pots

1. Cluster pots together in a sheltered corner (east side of structure ideal).
2. Mulch heavily around and over pots (6–12" leaves/straw).
3. Water deeply before hard freeze; check monthly during thaws.
4. Anti-desiccant spray (e.g., Wilt-Pruf) in late fall reduces winter burn.

Indoor Care for Non-Hardy Pots

• Place in unheated, attached garage (30–40°F ideal).
• Water sparingly—just enough to prevent desiccation.
• No fertilizer until spring.
• Return outdoors after last hard frost; acclimate gradually.

Bottom line: Invest in insulated resin pots if you want year-round outdoor display. Otherwise, plan for seasonal relocation.