Companion Plants
Winterizing canna plants saves you from losing those tropical-looking blooms forever. ✨ I’ve dug up cannas in late fall for years, and the ones I store properly always return with bigger, brighter foliage the next season. The key is timing, temperature, and a little patience—no fancy equipment needed.
You’ll need a shovel, a dry storage box, and a cool, dark spot like a basement or garage. After the first frost blackens the leaves, cut back the stems to 2 inches and carefully dig up the tubers.
Let them dry for a few days before storing in a breathable container with peat moss or vermiculite.
Come spring, those tubers will sprout fresh growth within weeks of replanting. The reward? A garden that looks like you’ve been growing cannas in zone 9 all along—just with a little seasonal prep. Here’s how to do it without losing a single tuber.
Works for both garden beds and containers, and the same method protects other tender tubers like dahlias. Let’s get those cannas through winter so you can enjoy them again next summer.
📚 In This Guide
- What you need
- Instructions
- Tips and common mistakes
- Wrapping up and next steps
What you need
- ● Garden gloves – Heavy-duty, waterproof gloves (1 pair) to protect your hands from dirt and sharp tools.
- ● Garden fork or trowel – A sturdy digging fork (for tubers) or a wide-bladed trowel (for smaller roots).
- ● Buckets or containers – At least 2-3 large buckets (5-gallon size or larger) for storing dug-up tubers.
- ● Potting mix or perlite – A well-draining mix (e.g., 50% peat moss, 50% perlite or sand) to store tubers in.
- ● Labeling tags & marker – Waterproof tags (10-20) to label tubers by variety.
- ○ Disinfectant (optional but recommended) – A 10% bleach solution (1 part bleach to 9 parts water) or hydrogen peroxide (3%) to clean tools and containers.
- ● Mulch (for in-place plants) – Straw, shredded leaves, or pine needles (2-3 inches thick) to insulate roots.
- ● Burlap or frost cloth – A lightweight cover (enough to drape over plants) to shield from wind and frost.
- ● Plastic bins with lids – For long-term tuber storage (e.g., 5-gallon plastic totes with ventilation holes).
- ● Vermiculite or coconut coir – To mix with potting soil for extra moisture retention during storage.
- ● Thermometer – A small digital thermometer to monitor storage temps (ideal: 45-55°F).
- ● Pruners – For trimming dead foliage before storage.
- ● Compost or fertilizer – A balanced, slow-release fertilizer (e.g., 10-10-10) to mix into soil when replanting in spring.
Step-by-Step instructions for winterizing canna plants
Here's how I protect my cannas every fall—simple steps to save your plants for next season's bold foliage and flowers.
🪴 Step 1: Wait Until First Frost
Don't rush—wait until your area's first frost date (check your local weather service) before digging. Cannas are tropical and can't survive freezing soil. I know it's tempting to dig early, but waiting ensures the tubers have fully matured and stored energy for next spring.
Look for yellowing leaves or blackened foliage as your signal. These signs mean the plant is shutting down and redirecting nutrients to its roots. If you dig too soon, the tubers won't be fully developed, and your plants may struggle to regrow.
✂️ Step 2: Cut Back Foliage and Dig Carefully
Use clean, sharp pruners to cut back the above-ground stems to about 2 inches above the soil line. This makes the tubers easier to spot and reduces weight for digging. I wear gloves—canna leaves can be sharp, and the sap sometimes irritates skin.
Gently loosen the soil around the base of the plant with a garden fork, then lift the entire clump out of the ground. Be careful not to slice into the tubers with the fork. If you see any damaged tubers, set them aside—they won't survive storage. You'll know you've done it right when you see the brown, knobby tubers still attached to the roots.
💧 Step 3: Clean and Cure the Tubers
Rinse off any clinging soil with a gentle stream of water, then let the tubers air-dry for 24 hours in a dry, shaded spot. This curing process helps prevent rot during storage. I place them on a wire rack or an old window screen to allow airflow on all sides.
Once dry, inspect each tuber for soft spots or signs of rot. Cut away any damaged areas with a clean knife, then let the cuts dry for another 1-2 hours. Healthy tubers should feel firm and slightly leathery, not mushy. If you find any that feel squishy or smell off, discard them immediately—they'll ruin the whole batch.
🪴 Step 4: Store in a Cool, Dark Place
Place the cured tubers in a paper bag or cardboard box (plastic traps moisture and causes rot). Store them in a cool, dark location where temperatures stay between 45-55°F. A garage, basement, or even a closet works well—just avoid refrigerators or areas prone to freezing.
Check on your tubers once a month to ensure they're not drying out or developing mold. If you notice any tubers shrinking or feeling too light, they've lost too much moisture. In that case, lightly mist them with water and let them dry again before storing. With proper care, your cannas will stay dormant until you're ready to replant in spring.
Tips & tricks for perfectly winterizing canna plants
Here's what I've learned after years of saving cannas—these tricks make all the difference between tubers that survive and ones that rot.
Timing is Everything: The 24-hour drying time in Step 3 isn't just arbitrary—it's when the tubers develop a protective skin that prevents rot during storage. If you're short on time, you can extend this to 48 hours for extra protection, but don't rush it. I've seen tubers rot in storage because they weren't fully cured. Place them in a spot with good airflow, like a garage with an open window, to speed up drying slightly without sacrificing quality.
Gloves Are Non-Negotiable: I learned this the hard way—canna sap contains oxalates that can irritate skin and even cause blisters. Wear thick gardening gloves when cutting back foliage in Step 2, especially if you have sensitive skin. The sap can also stain clothing, so consider wearing old clothes or an apron too. Trust me, the last thing you want is to ruin your favorite shirt while saving your plants.
Storage Space Matters: The 45-55°F temperature range in Step 4 is crucial for dormancy. A basement or garage works well, but avoid refrigerators—they can cause tubers to shrivel or develop mold. If your only option is a refrigerator, store them in a crisper drawer with a damp paper towel to maintain humidity, but check them weekly. I've had success using a closet with a small space heater set to maintain 50°F during cold snaps.
Monthly Checkups Save Tubers: That once-a-month check in Step 4 isn't just a suggestion—it's your best defense against rot. I keep a small notebook where I record the date and condition of each batch. If you notice any tubers shrinking, it's not too late to revive them. Lightly mist with water, let them dry completely (another 1-2 hours), and they'll often bounce back. The key is catching problems early before they spread.
Pro Tips for Winterize Canna Plants
- Here's what I've learned after years of saving cannas—these tricks make all the difference between tubers that survive and ones that rot.
- Timing is Everything: The 24-hour drying time in Step 3 isn't just arbitrary—it's when the tubers develop a protective skin that prevents rot during storage.
- Gloves Are Non-Negotiable: I learned this the hard way—canna sap contains oxalates that can irritate skin and even cause blisters.
Frequently asked questions
Got questions about winterizing your canna plants? You’re not alone!
Here are answers to the most common concerns—from timing to troubleshooting—so you can keep your tropical beauties thriving until spring.
When is the best time to winterize canna plants?
Start preparing canna plants for winter before the first hard frost (typically 2–4 weeks ahead). In most regions, this means late fall (October–November). If frost hits unexpectedly, act fast—cannas are sensitive to cold damage even above 32°F (0°C). Wait until foliage yellows naturally for cleaner dormancy.
Can I leave canna rhizomes in the ground over winter?
In Zone 8 or warmer, cannas may survive mild winters in the ground with a thick layer of mulch (6–8 inches). However, in colder zones (7 and below), dig up rhizomes—frozen soil can crack tubers or expose them to rot. For extra safety, lift and store them even in Zone 8 if winters dip below 20°F (-7°C).
What’s the ideal storage temperature for canna rhizomes?
Store rhizomes in a cool, dry spot (40–50°F / 4–10°C), like a garage, basement, or unheated shed. Avoid refrigerators (too cold/humid) or attics (temperature swings). Keep them in slightly damp peat moss or vermiculite, and check monthly for mold or soft spots—toss any that smell funky!
What if my cannas rot or mold during storage?
Mold or rot usually means too much moisture or poor airflow. If you spot fuzzy growth or slimy tubers, trim away affected areas with sterilized scissors, dust with cinnamon (natural antifungal), and replant only healthy sections. For severe cases, start fresh with new rhizomes—don’t risk spreading disease next season!
Can I grow cannas as annuals instead of winterizing?
If you’re not up for storage, treat cannas as annuals—enjoy their bold foliage and blooms all summer, then compost the plants after frost. Just know you’ll miss out on next year’s free, established plants (cannas multiply easily from rhizomes). For minimal effort, try Canna ‘Striped’ or Canna ‘Wyoming’, which are slightly hardier.
Wrapping up and next steps
Winterizing your canna plants doesn’t have to be a daunting task—with the right steps, you’re ensuring vibrant blooms for next season’s garden. By digging, trimming, and storing them properly, you’re giving these tropical beauties the best chance to thrive again.
Now that you’re equipped with the know-how, take action—grab your gloves, prep your storage space, and give your cannas the cozy winter break they deserve!
🌱 Next up: Mark your calendar to replant in spring and watch your garden explode with color once more!