Learning how to transplant canna lilies is a key skill for keeping these vibrant plants thriving. Moving canna lilies requires careful handling of their substantial rhizomes to avoid transplant shock. Whether you are dividing a crowded clump, moving plants to a new location, or preparing them for winter storage, the process is straightforward with the right timing and technique.
This guide provides a complete, step-by-step approach. You will learn when to move your plants, how to prepare them, and the best practices for replanting. Proper transplanting ensures your cannas return each season with vigorous growth and spectacular blooms.
How To Transplant Canna Lilies
Transplanting canna lilies involves digging up the rhizome root system and moving it to a new location. The goal is to minimize stress on the plant so it establishes quickly. Success depends on four main factors: timing, preparation, careful handling, and aftercare. Getting these elements right makes all the difference.
While cannas are resilient, they do best when transplanted during their dormant period or at the very start of their growing season. This gives the roots time to settle before demanding the energy for foliage and flowers. Let’s break down the entire process from start to finish.
When Is The Best Time To Transplant Canna Lilies
Timing is the most critical factor for a successful transplant. The ideal time depends on your climate and whether you are moving the plants in the ground or transferring them to containers for winter.
Transplanting In Spring
Spring is the absolute best time for transplanting canna lilies in most regions. Aim for after the last frost date when the soil has begun to warm. The plants are just emerging from dormancy, full of stored energy and ready to grow. This gives them an entire season to establish a strong root system.
- Soil temperature should be consistently above 60°F (15°C).
- New growth (eyes or shoots) on the rhizomes is typically 1-2 inches long.
- Spring planting allows for a full season of growth and flowering.
Transplanting In Fall
Fall transplanting is done primarily in warmer climates where the ground does not freeze hard. If you need to move plants in autumn, do it at least 4-6 weeks before the first expected frost. This provides enough time for some root establishment before winter dormancy.
- Only recommended for USDA zones 8 and above.
- Cut back the foliage after flowering has finished.
- Ensure the rhizomes are planted deeply enough to protect from mild frosts.
Transplanting For Winter Storage
In colder zones (7 and below), you will need to dig up canna rhizomes in the fall to store them indoors over winter. This is a form of transplanting from ground to storage. The process is similar, with the final step being curing and storing the rhizomes in a cool, dry place instead of replanting them immediately.
- Dig up rhizomes after the first light frost blackens the foliage.
- Cut stems back to about 2-3 inches.
- Gently brush off excess soil and allow them to cure for 1-3 days.
- Store in peat moss, vermiculite, or paper bags in a cool, dark location (45-55°F).
Essential Tools And Materials You Will Need
Gathering your supplies before you start makes the job smoother. You don’t need specialized equipment, just a few common garden tools.
- A sharp spade or garden fork for digging.
- Gardening gloves to protect your hands.
- A sharp, clean knife or pruning saw for dividing rhizomes.
- A hose or bucket of water for rinsing.
- Disinfectant (like a 10% bleach solution or rubbing alcohol) for cleaning tools.
- Baskets or trays for holding dug-up rhizomes.
- Fresh potting mix or well-amended garden soil for the new planting site.
- A slow-release fertilizer or bone meal to encourage root growth.
Step-By-Step Guide To Digging Up Canna Lilies
The first phase of transplanting is carefully removing the plant from its current location. The goal is to extract the rhizome clump with as much of the root system intact as possible while minimizing damage.
Step 1: Prepare The Plant
Begin by cutting back the foliage. Use clean pruners to trim the stalks down to about 4-6 inches above the soil line. This makes the plant easier to handle and reduces moisture loss during the transplant process. It also helps you see exactly where you need to dig.
Step 2: Dig Around The Clump
Start digging about 8-12 inches away from the base of the stalks. Push your spade straight down into the soil to slice through any outer roots, creating a wide circle around the plant. Canna rhizomes grow outward, so giving yourself plenty of room prevents accidentally spearing them.
Step 3: Lift The Rhizome Cluster
Once you have dug around the entire clump, work your spade or fork underneath it. Gently pry and lift the mass from the soil. If the plant is large and established, you may need to work from a few angles. Try to keep the root ball as intact as possible.
Step 4: Shake Off Excess Soil
Lay the clump on the ground or in a wheelbarrow. Gently shake it and use your hands to brush away loose soil. This allows you to see the structure of the rhizomes clearly. You can also rinse them lightly with a hose, but avoid soaking them or washing away all the soil if you plan to replant immediately.
How To Divide Canna Lily Rhizomes
Transplanting often goes hand-in-hand with dividing. Overcrowded clumps produce fewer flowers. Division creates new plants and rejuvenates the old one. Each division must have viable growth points to succeed.
Identifying Viable Divisions
Examine the mass of rhizomes. Look for thick, healthy sections with at least two to three “eyes” (the small, pinkish or white growth buds). Avoid sections that are mushy, rotten, or excessively dry and shriveled. Each division should have some smaller, hair-like roots attached.
The Division Process
- Clean your knife with disinfectant between cuts to prevent disease spread.
- Identify natural separations between rhizome segments.
- Make clean, sharp cuts to separate sections, ensuring each has its own eyes and roots.
- Trim away any dead or damaged parts of the rhizome.
You can let the cut surfaces air dry for a few hours before replanting to form a slight callus. This is especially helpful in humid climates to prevent rot.
Preparing The New Planting Site
While your divisions are drying, prepare their new home. Cannas thrive in full sun and rich, moist, well-draining soil. Proper site preparation is just as important as the transplanting itself.
Sunlight And Soil Requirements
Cannas need a minimum of 6 hours of direct sunlight daily for best flowering. The soil should be loose and fertile. If your soil is heavy clay, amend it generously with compost or well-rotted manure to improve drainage and nutrient content. They can also be grown in large containers with quality potting mix.
Amending The Soil
- Dig the planting hole about 12-14 inches deep and 16-18 inches wide.
- Mix the excavated soil with 2-3 inches of compost.
- Add a handful of bone meal or a balanced, slow-release fertilizer to the bottom of the hole and mix it with some soil.
Planting And Replanting Your Canna Divisions
Now for the main event: putting your canna lilies into their new location. Proper depth and spacing are crucial for healthy growth.
Correct Planting Depth And Spacing
Place the rhizome horizontally in the hole with the eyes facing upward. Cover it with 3-4 inches of soil. In colder regions, you can plant slightly deeper (4-5 inches) for added winter protection. Space multiple rhizomes 12-24 inches apart, depending on the variety’s mature size.
Watering And Initial Care
After backfilling the hole, water the area thoroughly to settle the soil around the rhizome and eliminate air pockets. Continue to keep the soil consistently moist (but not waterlogged) as new shoots emerge. Avoid letting the soil dry out completely during the first few weeks of establishment.
Post-Transplant Care And Maintenance
Your job isn’t over once the cannas are in the ground. Consistent care after transplanting helps them overcome stress and put energy into new roots and growth.
Watering Schedule After Transplanting
Water deeply immediately after planting. For the first 2-3 weeks, check soil moisture frequently. The top inch of soil should feel moist. As new growth appears and becomes established, you can gradually transition to a more normal watering routine, providing about 1 inch of water per week.
Fertilizing For Recovery And Growth
Wait until you see about 6-12 inches of new growth before applying fertilizer. Then, use a balanced, water-soluble fertilizer or a side-dressing of compost. Over-fertilizing too early can burn new roots. A second application mid-summer will support continued blooming.
Monitoring For Transplant Shock
Some wilting or yellowing of older leaves is normal. However, if all growth seems stunted or severely wilted after a week, check that the rhizome isn’t too deep or too shallow and ensure the soil moisture is adequate. Providing light shade for the first few days in very hot climates can help reduce stress.
Troubleshooting Common Transplant Problems
Even with care, issues can arise. Here’s how to identify and fix common problems related to transplanting canna lilies.
Signs Of Transplant Shock
- Wilting or drooping leaves that persists beyond a few days.
- Yellowing or browning of leaf edges.
- A complete halt in growth for an extended period.
To mitigate shock, ensure consistent moisture, provide temporary shade if needed, and avoid disturbing the plant further. A light application of a vitamin B1 transplant solution can sometimes help, but proper planting technique is more effective.
Preventing Rhizome Rot
Rot is caused by fungi or bacteria in waterlogged soil. It appears as soft, mushy, often foul-smelling sections on the rhizome. Prevention is key: ensure excellent drainage in the planting site, do not overwater, and plant at the correct depth. If you find rot during division, cut it all away until you reach clean, firm tissue.
Dealing With Pests After Transplant
Newly transplanted cannas can be slightly more vunerable to pests. Watch for common issues like slugs and snails chewing on new shoots, or aphids on tender foliage. Use organic deterrents like diatomaceous earth for slugs or a strong spray of water for aphids. Healthy, established plants are more pest-resistant.
Transplanting Canna Lilies In Containers
Cannas grow very well in large pots, which is ideal for patios or small spaces. The transplanting process for containers is similar but with a few specific considerations.
Choosing The Right Container
Select a pot that is at least 12-14 inches in diameter and depth for one rhizome. Larger varieties need bigger pots. Ensure the container has ample drainage holes. A heavy pot (like ceramic or wood) helps counterbalance the tall, top-heavy growth of cannas.
Potting Mix And Drainage
Use a high-quality, general-purpose potting mix. Do not use garden soil, as it compacts in containers. You can mix in some compost for extra fertility. Place a piece of broken pottery or a coffee filter over the drainage holes to prevent soil washout.
Plant the rhizome at the same 3-4 inch depth as in the ground. Water thoroughly after planting. Container plants dry out faster, so you will need to check moisture levels daily during hot weather.
FAQ About Transplanting Canna Lilies
Can You Transplant Canna Lilies In The Summer?
It is not ideal but can be done if absolutely necessary, such as during a garden renovation. The key is to minimize root disturbance and provide exceptional aftercare. Dig up as large a root ball as possible, keep it intact, and replant immediately. Water copiously and provide shade for at least a week. Expect some setback in flowering.
How Often Should Canna Lilies Be Divided?
Canna lilies typically benefit from being divided every 3-4 years. Signs that they need division include fewer flowers, crowded stalks, and a dead center in the clump. Regular division maintains plant vigor and provides you with new plants to expand your garden or share.
How Deep Do You Plant Canna Lily Rhizomes?
Plant canna rhizomes 3 to 4 inches deep. In regions with colder winters, err on the deeper side (4-5 inches) for added insulation. The eyes, or growth points, should be facing upwards when you place the rhizome in the ground.
Why Are My Transplanted Cannas Not Growing?
Several factors could cause this. The most common are planting too deep or too shallow, inconsistent watering, soil that is too cold, or damage to the eyes during division. Check your planting depth and soil moisture first. Patience is also key; they sometimes take a few weeks to show significant top growth as they focus energy underground.
Can You Transplant Canna Lilies While They Are Blooming?
It is highly discouraged. Transplanting during bloom diverts energy from flowering to root recovery, often causing the plant to abort its flowers. It also causes significant stress. If you must move a blooming plant, cut the flower stalks back first to reduce stress and be prepared for it to take a full season to recover its blooming potential.