Zone 6a Rosemary Winter Protection: Exact Mulch, Barrier, Plastic Method

Large in-ground rosemary in NW NJ (zone 6a) needs precise winter protection.

Hardy Varieties Only

'Arp' and 'Hill Hardy' survive -10°F. Others need this protocol.

Step-by-Step

1. Mulch: 6" well-draining material (straw, pine needles, shredded leaves) over root zone.
2. Barrier: Burlap or snow fencing circle around plant. Stake securely.
3. Wrap: Wire cage inside barrier. Clear plastic with holes over top + side slits. NOT airtight.
4. Water: ZERO all winter.
5. Sun: Full morning sun essential.

Spring

• Remove plastic March 1. Barrier/burlap April 1.
• Watch for new growth. Prune 1/3 from tips every 3 weeks.
• Feed fish/seaweed (Home Depot/Lowe's).

No guarantees for tender varieties. Take cuttings in fall as insurance.