Lithodora: The Beautiful Blue Groundcover
Introduction
Lithodora is a stunning blue-flowered plant that makes a lovely groundcover. It’s native to parts of France and southwestern Europe and prefers a cooler climate. While it’s not fully frost hardy, it can be grown in colder climates with a little extra care.
Varieties of Lithodora
There are several varieties of Lithodora, each with its own unique characteristics. Some popular varieties include:
- Lithodora diffusa: This variety has bright blue flowers and can spread up to 2 feet wide.
- Lithodora zahnii: This variety has larger, darker blue flowers and can spread up to 3 feet wide.
- Lithodora ‘Grace Ward’: This variety has pale blue flowers and is more compact, spreading only about 1 foot wide.
Growing Conditions
Lithodora prefers well-drained soil and full sun to partial shade. It’s relatively drought-tolerant, but it will produce more flowers if it’s watered regularly.
Frost Hardiness
Lithodora is only half-hardy, meaning it can tolerate some frost but not severe cold. In USDA hardiness zones 6 to 9, it can usually survive the winter outdoors with no protection. However, in colder zones, it’s best to provide some winter protection, such as mulch or a cold frame.
Winter Protection
If you live in a cold climate, there are a few things you can do to protect your Lithodora plants from winter damage:
- Mulch around the plants: A layer of mulch will help to insulate the roots and protect them from freezing.
- Provide a cold frame: A cold frame is a simple structure that can be placed over your plants to protect them from the cold and wind.
- Bring the plants indoors: If you have potted Lithodora plants, you can bring them indoors for the winter. Place them in a bright, cool location, such as a sunroom or basement.
Overwintering Lithodora
If your Lithodora plants have been damaged by the cold, don’t despair. They may still be able to recover. Here are a few tips for overwintering Lithodora:
- Trim off dead stems: In the spring, trim off any stems that have turned black or brown. This will encourage new growth.
- Fertilize: Fertilize your Lithodora plants in the early spring with a time-release formula. This will help them to recover from the winter and produce more flowers.
- Water: Water your Lithodora plants regularly, especially during the hot summer months.
Additional Tips
- Deadhead: Deadheading, or removing spent flowers, will encourage your Lithodora plants to produce more flowers.
- Divide: Lithodora plants can be divided in the spring or fall. This is a good way to propagate new plants.
- Companion planting: Lithodora pairs well with other low-growing plants, such as thyme, sedum, and creeping Jenny.
Conclusion
Lithodora is a beautiful and easy-to-grow groundcover that can add a touch of color to your garden. With a little care, it can even be grown in colder climates.
