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Bleeding heart plants (Dicentra spectabilis) are beloved for their delicate, heart-shaped flowers that bloom in spring and early summer. However, in colder climates, these plants often struggle to survive the harsh winter conditions. Using row covers is an effective method to protect bleeding hearts during the winter months, ensuring they come back healthy each year.
Understanding Row Covers
Row covers are lightweight fabrics that act as a barrier against cold temperatures, wind, and pests. They allow sunlight, air, and moisture to pass through while providing insulation. These covers are ideal for overwintering bleeding heart plants, especially in USDA zones 3 through 7.
Choosing the Right Row Cover
- Fabric Type: Look for spunbonded polypropylene or polyethylene fabrics, which are durable and breathable.
- Thickness: Thinner covers (1-2 ounces per square yard) are suitable for light protection, while thicker covers offer more insulation.
- Size: Ensure the cover is large enough to drape over the entire plant with some extra space for airflow.
Preparing Your Bleeding Heart for Covering
Before covering, cut back any dead or damaged stems and remove weeds around the plant. Water the soil thoroughly to ensure the plant is well-hydrated before winter. Mulching around the base with straw or shredded leaves can provide additional insulation.
Applying the Row Cover
Follow these steps to properly cover your bleeding heart:
- Gently lift the plant to avoid damaging the roots.
- Drape the row cover over the plant, ensuring it extends at least 6-12 inches beyond the foliage on all sides.
- Secure the edges with landscape staples, rocks, or soil to prevent wind from blowing the cover away.
- If necessary, create a frame using stakes or hoops to prevent the fabric from touching the plant directly, which can cause frost damage.
Monitoring and Maintenance
Throughout the winter, check the row cover periodically to ensure it remains in place and provides adequate protection. Remove the cover during warm spells to prevent excess moisture buildup and to allow airflow. Reinstall the cover once temperatures drop again.
Additional Tips for Successful Overwintering
- Timing: Cover your bleeding heart in late fall, before the first hard frost.
- Ventilation: Ensure there is some airflow to prevent mold or mildew.
- Spring Removal: Remove the cover as soon as the danger of frost has passed to allow the plant to wake up naturally.
Using row covers is a simple, effective way to protect your bleeding heart plants during winter. With proper preparation and maintenance, you can enjoy lush, healthy plants year after year, even in colder climates.