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Cardinal flowers (Lobelia cardinalis) are stunning perennial plants that add vibrant red color to gardens. They thrive in moist, well-drained soils and can be sensitive to cold temperatures. To extend their growing season and protect them during harsh winters, building a cold frame is an excellent solution. This step-by-step guide will help you create a cold frame tailored for your cardinal flowers, ensuring they stay healthy and beautiful year-round.
Materials Needed
- Wooden pallets or reclaimed wood
- Clear polycarbonate or glass panels
- Hinges and latches
- Screws and nails
- Saw and drill
- Measuring tape
- Weatherproof paint or sealant
- Stapler or adhesive (optional)
Step 1: Choose a Location
Select a sunny, sheltered spot in your garden that receives at least six hours of direct sunlight daily. Ensure the ground is level and well-drained to prevent waterlogging around your cardinal flowers.
Step 2: Measure and Cut Materials
Measure the dimensions of the area where you want to place your cold frame. Cut the wooden panels accordingly to create a box that is slightly wider and taller than your cardinal flowers, allowing space for growth and airflow.
Step 3: Assemble the Base
Using screws and a drill, assemble the wooden panels into a rectangular box. Reinforce the corners for stability. Sand any rough edges to prevent splinters and weatherproof the wood with paint or sealant to prolong its durability.
Step 4: Attach the Cover
Secure the clear panels to the top of the box using hinges on one side, allowing you to open and close the cold frame easily. Attach latches to keep the cover securely closed during windy or cold conditions.
Step 5: Position and Prepare the Cold Frame
Place the cold frame over your cardinal flowers, ensuring it fits snugly and provides ample space for airflow. Fill the interior with mulch or compost if desired to help regulate temperature and retain moisture.
Step 6: Maintain Your Cold Frame
Regularly open the cold frame on warm days to ventilate and prevent overheating. Check for any damages or leaks and repair as needed. During winter, keep the cover closed to protect your plants from frost and cold winds.
Benefits of Using a Cold Frame for Cardinal Flowers
- Extended growing season
- Protection from harsh winter conditions
- Improved plant health and growth
- Enhanced control over soil temperature and moisture
Building a cold frame is a simple yet effective way to safeguard your cardinal flowers and enjoy their vibrant blooms for longer. With proper construction and maintenance, your cold frame will serve as a valuable addition to your garden, promoting healthy and resilient plants year after year.