Winterizing Knock Out Tree Roses in Illinois: The Shelley Double-Graft Method

Two grafts = double trouble. Standard tree roses have a rootstock graft at soil level AND a variety graft at the top (3.5 ft). Both need protection in Zone 5 Illinois winters.

The Shelley Technique (Yankee District, ARS)

Proven easier and more effective than Minnesota-tip burial. Materials per tree:

• Dormant oil spray (Ultra-Fine)
• Salt marsh hay (1 bale = 6 trees)
• 3/4" pipe insulation tubing (8 ft sections)
• Bubble wrap (18" x 9 ft roll = 6 trees)
• Burlap (3' x 25' roll = 6 trees)
• Electrical tape

Step-by-Step (Weekend After Thanksgiving)

1. Strip foliage (cut, don't pull). Light prune, leave 2 ft canes. Seal large cuts.
2. Spray thoroughly with dormant oil (5 tsp/gal). Include trunk, bud unions, ground.
3. Seal bud union cracks with grafting wax.
4. Wrap trunk with pipe insulation from ground up, overlapping lower bud union.
5. Mound soil/mulch 12" up rootstock.
6. Fill interior with loose salt marsh hay.
7. Wrap bubble wrap from 4" below top bud union up 12".
8. Position hay around bubble wrap, wrap with burlap, secure with electrical tape.
9. Leave top 8-12" open for moisture entry, mouse deterrence.
10. Final dormant oil spray. "Live long and prosper."

Critical Details

• Double-stake—heavy snow loads topple trees
• Light fall pruning only—let canes store energy
• Method works for tender hybrid teas in Zone 4 too (add pipe wrap on canes)

Full illustrated guide here.

Ten minutes per tree. Your Knock Out standards will thank you in April.