With their vibrant colors and striking foliage, canna lilies are a standout choice for summer gardens. These tropical plants can grow as tall as 8 feet, showcasing lush, striped leaves and bold blooms that brighten any outdoor space.
Fast-growing and resilient, canna lilies are not true lilies but are related to banana and ginger. They bloom from midsummer until the first frost, or even longer in warmer zones (7-10). Their care requires minimal effort: just regular watering and occasional slow-release fertilizer.
These sun-loving plants have sturdy stems, eliminating the need for support. They serve well in poolside settings and as natural privacy screens. However, their paddle-like leaves can suffer in windy conditions. If necessary, learn how to prune canna lilies to maintain their appearance. Here, we share expert advice on growing these stunning flowers in your outdoor space.
Growing Canna Lilies
There are several methods for growing canna lilies: from seeds, rhizomes, or by division. Each method has its own benefits and timing considerations.
Growing Canna Lilies from Seeds
Starting canna lilies from seeds is a rewarding process, though it typically takes longer than planting rhizomes. Seeds can differ from their parent plants.
According to a horticulturist, “Canna seeds are dark and pea-sized, with a tough outer shell that needs scarification.” If you’d rather not scarify, soak the seeds in warm water for 48 hours before planting them in multipurpose compost.
Cover the seeds with half an inch of compost and keep the temperature at 70°F for germination. Once they sprout, lower the temperature to 60°F until the danger of frost passes.
Seeds will not bloom until their second year, but watching them grow is incredibly rewarding.
Growing Canna Lilies from Rhizomes
The fastest way to cultivate canna lilies is from rhizomes, which are easy to plant.
Before planting, ensure the soil temperature is above 50°F and that frost is no longer a threat. For colder climates, starting canna indoors is an option. Use a pot with good drainage and sufficient size to accommodate the plant’s growth. Plant the rhizome horizontally, about 2-3 inches deep.
Don’t worry about the orientation of the eyes; they will grow upward no matter how they’re positioned. Rhizomes are readily available at plant nurseries and online retailers.
Growing Canna Lilies by Division
Propagating canna lilies through division is a simple way to expand your garden. It’s best to do this in spring.
Remove any soil from the rhizomes and identify pieces with at least two or three ‘eyes.’ Use a sharp knife to make clean cuts, ensuring you’re left with healthy sections.
Plant the divisions in well-draining, loam-based compost, burying them about 3 inches deep. Water them well and place them in bright, indirect light until they sprout. Transplant outside when temperatures reach 50°F or more and frost is no longer a concern.
Storing Canna Rhizomes Over Winter
To store canna rhizomes, wait until the first frost has killed the foliage. Carefully dig up the rhizomes, shake off excess soil, and place them in a warm, dry area to dry out. Store them in a cool, dark, and dry location, allowing for airflow to prevent moisture damage.
Ready to add these stunning canna lilies to your garden? Check out these tropical garden ideas for additional inspiration.
