Table of Contents
- Introduction
- When to Replant Canna Lilies
- Choosing the Perfect Spot
- Preparing the Rhizomes for Replanting
- Step-by-Step Guide to Replanting in the Ground
- Caring for Newly Replanted Cannas
- Managing Common Growth Scenarios
- Replanting in Containers vs. the Ground
- Realistic Expectations for the First Season
- Winter Preparation for Replanted Cannas
- Conclusion
- FAQ
Introduction
There is nothing quite like the bold, tropical flair of Tall Cannas to make a backyard feel like a private island getaway. With their towering stalks and vibrant, banana-like leaves, these plants are a favorite for adding height and drama to garden beds. At Longfield Gardens, we love how tall cannas bridge the gap between summer and fall with their non-stop blooms and lush foliage.
Replanting canna lily bulbs—technically called rhizomes—is a straightforward task that any gardener can master. Whether you are moving them to a sunnier spot, dividing a crowded clump, or putting stored bulbs back into the earth for spring, the process is very rewarding. If you want even more warm-season color, browse our Spring-Planted Summer-Blooming Bulbs. This guide is designed to help you handle every step of the replanting process with confidence.
By following a few simple steps regarding timing, soil preparation, and planting depth, you can ensure your cannas grow tall and strong. Success starts with understanding what these tropical beauties need to thrive in your specific garden environment.
When to Replant Canna Lilies
Timing is one of the most important factors when replanting cannas. Because these are tropical plants, they are highly sensitive to cold temperatures. If you plant them too early in the spring, the rhizomes may sit in cold, damp soil, which slows down their development.
In most parts of the United States, the best time to replant canna lily bulbs is in the late spring. You should wait until the danger of frost has completely passed and the soil has warmed up to at least 60°F. If the ground feels warm to the touch, your cannas will settle in much faster and begin pushing up new growth within a few weeks.
For gardeners in warmer climates, such as USDA zones 8 through 11, cannas can often stay in the ground year-round. However, even in these regions, you may want to replant them every three to four years to prevent overcrowding. In these warm zones, the best time to dig and move them is in the late winter or very early spring before they start their active growing season.
What to do next: Check your local frost dates. If you are still seeing chilly nights, keep your canna bulbs in a cool, dry place for a few more weeks before moving them into the ground.
Choosing the Perfect Spot
Before you start digging, take a look at your garden to find the best possible home for your cannas. These plants are "horticultural titans," and they need a location that can support their rapid growth and heavy flowering.
Sunlight Requirements
Cannas are sun-worshippers. To get the best flower production and the most vivid leaf colors, they should be planted in a spot that receives at least six to eight hours of direct sunlight every day. While they can grow in partial shade, you will notice that the stems may become "leggy" as they reach for the light, and you will see fewer blooms.
Soil and Drainage
While cannas love moisture, they do not like to sit in stagnant water. The ideal soil is rich, fertile, and well-draining. If you have heavy clay soil that stays soggy for days after a rain, it is helpful to amend the area with organic matter. Adding compost or leaf mold can help improve the soil structure, allowing excess water to move away while still keeping the roots hydrated.
Space to Grow
Consider the mature height and width of your specific canna variety. Some dwarf varieties only grow two to three feet tall, while standard types can easily reach six feet or more. Make sure you aren't planting them where they will block the view of smaller perennials or crowd out neighbors that prefer more breathing room.
Preparing the Rhizomes for Replanting
If you are replanting cannas that you just dug up from another part of the yard, or if you are taking them out of winter storage, you need to prepare the rhizomes first. A rhizome looks like a thick, fleshy root, similar to a ginger root.
Cleaning and Inspecting
Gently brush off any excess soil so you can clearly see the structure of the rhizome. Look for "eyes," which are the small, rounded bumps or points where new stems will emerge. A healthy rhizome should feel firm and heavy for its size. If you find any soft or mushy spots, you can simply trim those parts away with a clean knife.
Dividing for More Plants
One of the best things about cannas is how quickly they multiply. If your original clump has grown quite large, this is the perfect time to divide it. You can break the rhizomes apart by hand or use a sharp garden knife.
Each piece you plan to replant should have at least one to three healthy eyes. Having multiple eyes on a single piece usually results in a fuller, more substantial plant in the first season. Small pieces with only one eye will still grow, but they may take a little longer to reach their full potential.
Sterilizing Tools
If you choose to use a knife for dividing, it is a good idea to wipe the blade with rubbing alcohol or a weak bleach solution between plants. This simple step prevents the spread of soil-borne issues from one clump to another.
Step-by-Step Guide to Replanting in the Ground
Once your site is ready and your rhizomes are prepared, it is time to get them back into the earth. Following the correct depth and spacing rules will make a significant difference in how quickly the plants establish themselves.
Step 1: Dig the Hole
Dig a hole or a trench that is about 4 to 6 inches deep. If you are planting several cannas in a row, a long trench is often easier than digging individual holes. This depth protects the rhizome from temperature fluctuations while keeping it close enough to the surface to feel the warmth of the sun.
Step 2: Add Soil Amendments
Cannas are heavy feeders. Before placing the rhizome in the hole, we often recommend mixing a handful of compost or a well-balanced, slow-release fertilizer into the bottom of the hole. This gives the plant an immediate source of nutrients once the roots start to grow.
Step 3: Positioning the Rhizome
Place the rhizome into the hole horizontally (laying flat). Ensure that the "eyes" or growing points are facing upward toward the sky. If you aren't sure which way is up, don't worry too much—cannas are resilient and the shoots will eventually find their way to the surface, but planting them with the eyes up gives them a helpful head start.
Step 4: Spacing
Space your cannas according to how far apart you should plant canna bulbs:
- Tall varieties: 18 to 24 inches apart.
- Dwarf or medium varieties: 12 to 18 inches apart.
- Mass plantings: If you want a solid screen of foliage, you can space them slightly closer, but remember that good air circulation helps keep the foliage looking its best.
Step 5: Covering and Firming
Fill the hole back in with soil. Gently press down with your hands to remove any large air pockets. You don't need to pack the soil down hard; just a firm pat is enough to ensure the rhizome has good contact with the earth.
Step 6: Initial Watering
Water the area thoroughly immediately after planting. This "settles" the soil around the rhizome and signals to the plant that it is time to wake up and start growing.
Key Takeaway: Replanting cannas at a depth of 4 to 6 inches with the eyes facing up ensures the best start. Providing enough space between plants allows for proper air circulation and future growth.
Caring for Newly Replanted Cannas
The first few weeks after replanting are the most critical. While cannas are tough plants, they need consistent care while they are establishing their new root systems.
Water Consistently
During the first month, keep the soil consistently moist but not waterlogged. Once you see green shoots poking through the soil, you can transition to a deeper watering schedule. At Longfield Gardens, we recommend watering canna bulbs after planting rather than giving them a light sprinkle every day. This encourages the roots to grow deeper into the soil, making the plant more drought-tolerant later in the summer.
Mulching
Adding a 2-inch layer of mulch around the base of the plants can be very beneficial. Mulch helps retain soil moisture and keeps the ground temperature stable. It also prevents weeds from competing with your cannas for nutrients and water. Use organic mulch like shredded bark, compost, or clean straw.
Fertilizing
Once the plants are about 6 to 12 inches tall, they will appreciate a boost of nutrients. You can apply a balanced liquid fertilizer every few weeks or use a granular slow-release fertilizer according to the package directions. High-nitrogen fertilizers will encourage lush, green leaves, while those with a bit more phosphorus will support better blooming.
Managing Common Growth Scenarios
As your cannas begin to grow in their new location, you might encounter different situations depending on your weather or soil. Here is how to handle a few common scenarios.
Slow Starting Growth
If you've replanted your cannas but don't see growth after two or three weeks, don't panic. Canna lilies are tropical and wait for the "perfect" moment to emerge. If the spring has been particularly rainy or cool, the rhizomes are likely just waiting for a stretch of warm, sunny days. As soon as the soil temperature stays consistently high, they will catch up quickly.
Supporting Tall Varieties
In very windy locations, tall canna varieties can sometimes lean or topple over, especially after a heavy rain. If you know your garden gets a lot of wind, consider planting them near a fence or wall for protection. You can also use sturdy bamboo stakes to provide support for individual stems if needed.
Pests and Foliage Care
Keep an eye out for "canna leaf rollers," which are small caterpillars that can stitch the leaves together before they unfurl. If you see leaves that look stuck or rolled up, you can gently unroll them and remove the pest by hand. Keeping the area around the base of the plants free of debris also helps reduce pest hiding spots.
Replanting in Containers vs. the Ground
While this guide focuses on replanting in the ground, many gardeners choose to start their cannas in pots before moving them to the garden. This is a great "hack" for those with short growing seasons.
By planting your rhizomes in large containers indoors or in a greenhouse about four to six weeks before the last frost, you give them a massive head start. When the weather finally warms up, you can transplant the entire root ball into the ground.
If you choose this method, be extra careful not to disturb the roots too much during the move. Dig a hole in the garden that is twice as wide as the pot and just as deep. Slide the plant out of the container and set it into the hole, filling the gaps with fresh soil and watering well.
Realistic Expectations for the First Season
When you replant canna lily bulbs, it is helpful to keep in mind that the plant is putting a lot of energy into building a new root system.
- First Year Growth: If you divided a large clump into small pieces, the plants might be slightly shorter in their first year than they were in their previous location. This is normal and expected.
- Bloom Timing: Depending on when you replanted, you might see flowers a little later in the summer than usual. Most cannas begin blooming in mid-to-late summer and continue until the first frost.
- Foliage Quality: The leaves are the star of the show. Even if the flowers are a few weeks late, the stunning foliage will provide plenty of color and texture in the meantime.
Winter Preparation for Replanted Cannas
The cycle of replanting often ends with winter care. In cold climates (Zones 7 and lower), the ground will freeze, which can damage canna rhizomes. To keep your plants for next year, you will need to lift them again in the fall.
Wait until the first light frost has blackened the foliage. This signals the plant to go dormant and move its energy down into the rhizome. Cut the stalks down to about 4 inches, carefully dig up the clump, and let it dry in a frost-free area for a few days. You can then store them in a box with peat moss or vermiculite in a cool, dark place (around 45–50°F) until it is time to replant them next spring.
In warmer zones, you can simply leave the foliage until it turns brown, then cut it back to the ground. A thick layer of mulch will protect the rhizomes through the winter months, and they will sprout again on their own when spring returns.
Conclusion
Replanting canna lily bulbs in the ground is one of the most effective ways to refresh your landscape and multiply your Assorted Cannas collection of these tropical favorites. By choosing a sunny spot, ensuring good drainage, and waiting for the soil to warm up, you set the stage for a spectacular summer display. Gardening is an ongoing journey of learning and growth, and cannas are some of the most forgiving and rewarding plants you can work with.
- Wait for Warmth: Only replant once the soil reaches 60°F and frost is a distant memory.
- Prioritize Sun: Give your cannas at least 6 hours of direct light for the best color.
- Space Appropriately: Avoid overcrowding to ensure the plants have room to reach their full, majestic height.
- Water Deeply: Consistent moisture leads to lush leaves and vibrant blooms.
Replanting cannas is a simple way to bring a touch of the tropics to your own backyard. At Longfield Gardens, we believe that every gardener can achieve professional-looking results with these high-impact plants.
For more ideas, browse our Shop Spring Planted Collections. The next time you look at your garden and want a big change, consider moving or adding canna lilies. Their easy-to-handle rhizomes and rapid growth make them a perfect choice for gardeners of all skill levels.
FAQ
How deep should I plant canna lily bulbs when replanting?
Canna lily rhizomes should be planted approximately 4 to 6 inches deep. This depth provides enough soil cover to protect the rhizome from drying out while allowing the sun's warmth to reach it and stimulate new growth. If you are planting in a container, you can use the same depth, ensuring there is plenty of room for root expansion below.
Do I need to soak canna rhizomes before replanting them in the ground?
While it is not strictly necessary to soak canna rhizomes, some gardeners find that a 24-hour soak in room-temperature water helps "wake up" stored or very dry bulbs. If your rhizomes look plump and firm, you can skip the soaking and simply water them thoroughly immediately after they are placed in the ground.
Can I replant canna lilies while they are still in bloom?
It is best to avoid replanting cannas while they are actively blooming, as this can cause the plant significant stress and lead to wilting. The ideal time to move or replant them is in the spring before they have started significant growth. If you must move them in mid-summer, dig up as much of the root ball as possible and provide extra water and shade for several days after the move.
How do I know which way is "up" on a canna rhizome?
Look for the "eyes," which are small, pointed nodes or bumps on the surface of the fleshy rhizome. These eyes should be pointed upward when you place the rhizome in the ground. If you cannot see any eyes, lay the rhizome horizontally in the hole; the plant is naturally designed to send its shoots toward the surface regardless of its orientation.