Cannas are a popular choice for gardeners looking to add bold, tropical beauty to their landscapes. These striking plants, with their large foliage and vibrant flowers, are grown from rhizomes—underground stems that can be easily planted and cultivated. If you’re looking to grow cannas from rhizomes, following the right steps can ensure a healthy and thriving garden. Here are eight key tips to help you plant and care for cannas effectively.
1. Choose Healthy Rhizomes
The first step to successful canna planting is selecting healthy rhizomes. Healthy rhizomes are firm to the touch, free from soft or mushy spots, and typically white or cream in color. Avoid any rhizomes that appear blackened or shriveled, as these may be signs of rot or dehydration. Always prioritize firm, healthy rhizomes for the best results.
2. Wake Them Up Early
If you’re in a region with a short growing season, consider starting your cannas indoors. About four to six weeks before the last expected frost, plant your rhizomes in a container, water them, and place them in a warm spot. This early start will allow the rhizomes to come out of dormancy, giving you a head start on the growing season. This method will result in lush foliage and vibrant blooms much earlier than if you wait to plant them outdoors.
3. Plant at the Right Depth
When planting cannas, it’s important not to bury the rhizomes too deeply. While some sources suggest planting them 6 inches deep, 3 to 4 inches is more than enough. Dig a hole large enough for the rhizome to be placed horizontally, ensuring that the “eyes” or growth buds are at least 2 inches below the soil surface. Planting too deep can delay sprouting and stunt the plant’s growth.
4. Use Large Containers for Container Planting
Cannas grow best in large containers, especially if you’re dealing with larger varieties. An 18-inch pot is ideal for a single canna plant, allowing enough space for the root system to grow. Larger containers, such as those with a 24-inch diameter, can house multiple plants. Additionally, larger pots provide stability, preventing your tall cannas from tipping over during windy conditions.
5. Wait Until the Soil Warms Up
Cannas thrive in warm conditions and do not tolerate frost. Wait until the soil temperature reaches at least 50°F (preferably 60°F) before planting your rhizomes outdoors. A great rule of thumb is to plant your cannas around the same time you would plant tomatoes in your area, as this ensures that the risk of frost has passed and the soil is warm enough for optimal growth.
6. Harden Off Your Plants
If you start your cannas indoors before moving them outside, it’s important to acclimate them gradually. This process, known as hardening off, involves slowly introducing your plants to the outdoor conditions over the course of a week. This prevents shock and helps your plants adjust to direct sunlight and outdoor temperatures before being fully transplanted into the garden.
7. Know Which Side Is Up
When planting canna rhizomes, it’s essential to position them correctly. If the rhizomes have started sprouting, the “eyes” or buds will clearly show you which way is up. If the rhizomes are still dormant, look carefully for the eyes and plant them with these facing upwards. Ensure the rhizome is laid horizontally in the soil to promote healthy growth.
8. Order Cannas in Winter for Spring Planting
To ensure you get the best selection of cannas, consider ordering your rhizomes in the winter months. Popular varieties often sell out quickly, and waiting until spring may leave you with limited options. By ordering early, you can store the rhizomes until the right planting time in the spring. Additionally, many big box stores offer deep discounts on unsold rhizomes toward the end of spring, making it the perfect time to grab any remaining stock for planting.
Planting cannas from rhizomes can be an enjoyable and rewarding experience. By following these tips, you’ll be able to grow beautiful, vibrant plants that will add tropical flair to your garden or landscape. Whether you’re starting indoors for an early start or planting directly in your garden, proper preparation and care will ensure your cannas flourish all season long.
