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Hollyhocks are beautiful, tall flowers that add charm to any garden. However, they can be sensitive to cold weather, especially in regions with harsh winters. Building a cold frame is an effective way to protect hollyhocks during the winter months and ensure they come back strong in the spring. This guide will walk you through the steps to create a simple and functional cold frame for overwintering your hollyhocks.
Materials Needed
- Wooden pallets or untreated lumber
- Old windows or clear acrylic panels
- Hinges
- Screws and nails
- Door latch or clasp
- Staple gun and plastic sheeting (optional)
- Staples or weatherproof sealant
- Measuring tape
- Saw
- Drill
Constructing the Cold Frame
Begin by choosing a suitable location in your garden that receives ample sunlight during the winter. Clear the area and level the ground. Measure the dimensions needed to accommodate your hollyhocks, typically about 3 to 4 feet wide and 2 to 3 feet deep.
Assemble the base frame using the lumber or pallets. Ensure the structure is sturdy and level. Attach the sides to form a box, leaving one side open or with a hinged lid for easy access and ventilation.
If using old windows, place them on top of the frame to act as a transparent cover. Secure the windows with hinges on one side, allowing you to lift the cover for ventilation and maintenance. Alternatively, attach clear acrylic panels with screws and weatherproof sealant to prevent drafts.
Installing the Cold Frame
Place the cold frame over the hollyhocks, ensuring they are well covered but still able to receive sunlight. Bury the edges of the frame slightly into the soil to prevent cold air from seeping underneath. Use soil, mulch, or bricks around the base to secure it in place and improve insulation.
Make sure the lid or window can be easily opened for ventilation on warmer days. Proper airflow is essential to prevent mold and overheating inside the cold frame.
Additional Tips for Overwintering Hollyhocks
- Water the hollyhocks sparingly during winter to prevent root rot.
- Add mulch around the base for extra insulation.
- Monitor the temperature inside the cold frame regularly.
- Remove snow from the cover to maintain sunlight exposure.
- In extremely cold regions, consider adding a layer of straw or bubble wrap inside the cold frame for extra protection.
With a little effort, your hollyhocks will be protected from harsh winter conditions and ready to bloom again in the spring. Building a cold frame is an affordable and effective way to extend the life of your beloved garden plants.