Protecting tomato plants from the risk of frosts or chilling temperatures requires covering foliage and stems. Although any lightweight fabric can be used, anchoring them to prevent the wind from blowing them free of the plants and exposing tender foliage is always a concern. Covering the tomato cage with bubble wrap and securing it to the cage creates an insulated area for young seedlings and protects them from frost.
Measure the distance around the of tomato cage at its widest point. Typical wire cages are formed in an inverted pyramid with the widest point at the top. Note the measurement.
Measure the distance from the ground to the top of the cage.
Add 4 inches to the measurements of the tomato cage and cut bubble wrap to size. Cut between bubbles to preserve the insulating effect and for ease of cutting.
Align the bubble wrap with the cage so the bottom rests slightly above the ground level. The top will extend 4 inches above the top of the cage.
Begin at the top of the tomato cage wrap the bubble wrap around the cage overlapping the edges. Pull snugly to make a tight fit and secure with packing or duct tape. Continue to pull the bubble wrap taut and tape in place as you work your way to the bottom of the cage.
Fold the top edge toward the inside of the cage and tape to secure in place.