Table of Contents
- Introduction
- Understanding the Canna Lily's Growth Cycle
- Two Ways to Grow Cannas Indoors
- Light Requirements: The Biggest Challenge
- Choosing the Right Container and Soil
- How to Plant Canna Rhizomes Indoors
- Water and Humidity: Recreating the Tropics
- Feeding for Growth and Bloom
- Pruning and Maintaining Your Indoor Canna
- Choosing the Best Varieties for Indoor Growing
- Managing the Seasonal Transition
- Troubleshooting Common Indoor Issues
- Conclusion
- FAQ
Introduction
There is nothing quite like the bold, tropical look of a canna lily to make a garden feel like a private island escape. These plants are famous for their oversized, banana-like leaves and vibrant blooms that stand tall in the summer sun. While most people think of them as strictly outdoor stars, many gardeners find themselves wishing they could enjoy that lush greenery all year long. At Longfield Gardens, we believe that gardening should be a flexible and creative experience that fits your lifestyle.
The good news is that you can absolutely grow canna lilies indoors. Whether you want to give your rhizomes a head start before the spring thaw or keep a potted canna as a permanent houseplant, these versatile plants are surprisingly adaptable. Because they are tropical perennials, they do not require a cold dormancy period to survive. As long as you can provide enough light and consistent moisture, your cannas can thrive inside your home. For a step-by-step walkthrough, see How to Start Planting Canna Bulbs Indoors: A Step-by-Step Guide.
This guide will explain exactly how to manage canna lilies in an indoor environment. We will cover everything from choosing the right containers and soil to managing light levels and humidity. By following these simple steps, you can bring a touch of the tropics into your living room or sunroom. If you are deciding whether pots are the right setup, our guide on Can Canna Bulbs Be Planted in Pots? Simple Growing Guide is a helpful companion.
Understanding the Canna Lily's Growth Cycle
To grow canna lilies successfully indoors, it helps to understand how they grow in nature. Cannas are native to the tropical and subtropical regions of the Americas. In their natural habitat, they often grow in damp, marshy areas or near the edges of ponds. This means they are biologically programmed to love heat, high humidity, and plenty of water.
One of the most interesting things about canna lilies is that their dormancy is optional. In colder climates, we usually dig them up and store them for the winter because they cannot survive a freeze. However, in the tropics, they grow year-round. If you keep the environment warm and the soil moist, the plant will keep producing new shoots and flowers without ever needing to "sleep." If you garden in a colder region, the Hardiness Zone Map can help you understand your growing conditions.
Because they grow from thick, starchy structures called rhizomes, they have a built-in energy reserve. This makes them quite resilient. If the soil dries out completely, the plant may go dormant to protect itself, but it can be "woken up" again with water and warmth. This flexibility is what makes them such excellent candidates for indoor growing.
Two Ways to Grow Cannas Indoors
There are generally two reasons a gardener might want to bring cannas inside. Knowing which path you are taking will help you provide the right care.
Starting Rhizomes Early for the Garden
Many gardeners in northern zones start their cannas indoors in late winter or early spring. This "pre-starting" method gives the plants a four-to-six-week head start. By the time the weather is warm enough to move them outside, you already have established plants rather than just bare rhizomes in the dirt. This often results in much earlier blooms during the summer season. If you are planning ahead, the Shipping Information page can help you time your order.
Keeping Cannas as Permanent Houseplants
The second option is to grow cannas as year-round houseplants. This is a great choice if you have a very bright sunroom or a large south-facing window. In this scenario, you treat the canna like any other tropical indoor plant, such as a bird of paradise or a large philodendron. You won't be digging it up or moving it; instead, you’ll focus on maintaining consistent growth throughout the seasons.
Light Requirements: The Biggest Challenge
Light is the single most important factor when growing canna lilies indoors. In an outdoor garden, these plants usually want six to eight hours of direct, intense sunlight. Replicating that intensity inside a house can be tricky, but it is not impossible.
Finding the Right Window
A large, south-facing window is usually the best spot for an indoor canna. This location provides the most consistent and strongest light throughout the day. If you don't have a south-facing window, a west-facing window is the next best option. East-facing windows may provide enough light for the foliage to stay green, but the plant may struggle to produce flowers.
Using Supplemental Grow Lights
If your home doesn't get enough natural light, or if you are trying to keep the plant blooming through the dark winter months, you might need a grow light. Simple LED grow lights can provide the specific spectrum of light that plants need for photosynthesis. Place the light a few inches above the top of the foliage and keep it on for 12 to 14 hours a day to mimic a bright summer day.
Key Takeaway: If your canna looks "leggy"—meaning the stems are very thin and stretching toward the window—it is a sign the plant needs more light. Move it to a brighter spot or add a grow light to help it stay strong and compact.
Choosing the Right Container and Soil
Cannas are vigorous growers, and their root systems need plenty of space to expand. Choosing the right "home" for your plant's rhizomes will prevent them from becoming cramped and stressed.
Container Size
For a single canna rhizome, you should use a pot that is at least 12 to 15 inches wide and just as deep. If you are planting a dwarf variety, you might be able to use a slightly smaller container, but bigger is generally better. The pot must have drainage holes at the bottom. Even though cannas love water, they do not like to sit in stagnant, anaerobic mud, which can cause the rhizomes to rot.
The Best Potting Mix
Use a high-quality, well-draining potting soil. Avoid using garden soil from your backyard, as it is often too heavy and may contain pests or diseases that can thrive in an indoor environment. A mix that includes peat moss, perlite, or vermiculite will provide the right balance of moisture retention and aeration. We recommend choosing a mix designed specifically for containers to ensure your plants get off to a healthy start.
How to Plant Canna Rhizomes Indoors
If you are starting with bare rhizomes, the planting process is simple and rewarding. Watching those first green spikes emerge from the soil is a great way to beat the winter blues.
- Check the Rhizomes: Look for firm rhizomes with at least one or two "eyes" (growing points). If the rhizome feels mushy or very lightweight and shriveled, it may not be viable.
- Soak Before Planting: To give the rhizomes a boost, you can soak them in a bowl of lukewarm water for two to three hours before planting. This rehydrates the tissue and signals the plant to begin growing.
- Positioning: Fill your pot about two-thirds full with potting mix. Lay the rhizome horizontally on the soil. The eyes should be pointing upward, though the plant is smart enough to find the light even if it’s planted sideways.
- Depth: Cover the rhizome with about four inches of soil. This depth provides enough weight to support the tall stems as they grow and ensures the roots have plenty of room to anchor the plant. If you want more detail on this step, see How Deep Do You Plant Canna Lily Bulbs? Expert Planting Guide.
- Watering: Water the soil thoroughly until it drains out of the bottom of the pot. Place the pot in a warm spot, ideally around 65°F to 75°F.
Water and Humidity: Recreating the Tropics
Because cannas are naturally swamp-dwellers, their water needs are different from most other houseplants. While many indoor plants need to dry out between waterings, cannas prefer to stay consistently moist.
Watering Frequency
Check the soil daily. If the top inch of soil feels dry to the touch, it is time to water. In the heat of summer, or if your indoor air is very dry due to heating systems, you may need to water every day or two. If you notice the tips of the leaves turning brown and crispy, the plant is likely thirsty or the air is too dry.
Managing Humidity
Indoor air, especially in the winter, is often much drier than the humid tropical air cannas prefer. You can increase the humidity around your plant by placing the pot on a tray filled with pebbles and a little water. As the water evaporates, it creates a humid microclimate around the leaves. Just make sure the bottom of the pot is resting on the pebbles and not sitting directly in the water.
Feeding for Growth and Bloom
Cannas are "heavy feeders," meaning they use up nutrients quickly to fuel their rapid growth and large flowers. When growing them in a container, those nutrients are limited to what is in the potting mix, so you will need to provide regular "meals."
Choosing a Fertilizer
Use a balanced, water-soluble fertilizer. A formula with an even ratio (like 10-10-10) works well for overall health. If you want to encourage more blooms, you can look for a fertilizer with a slightly higher middle number (phosphorus).
Application Schedule
During the active growing season (spring and summer), fertilize your indoor canna every two weeks. If you are keeping the plant growing through the winter, you can reduce this to once a month, as the plant’s metabolism will naturally slow down slightly with the shorter days. Always follow the instructions on the product label to avoid over-fertilizing, which can lead to salt buildup in the soil.
Pruning and Maintaining Your Indoor Canna
To keep your canna lily looking its best, you will need to do some basic grooming. This not only keeps the plant pretty but also encourages it to produce more flowers.
Deadheading
As flowers fade, pinch or snip them off. This process, called deadheading, prevents the plant from putting energy into producing seeds. By removing the old blooms, you signal to the plant that it should keep producing new flower spikes.
Removing Old Stems
Each individual canna stem will only produce two or three clusters of flowers. Once a stem has finished blooming and the leaves on that specific stalk start to look a bit tired, you can cut the entire stem back to the soil line. Don't worry—the rhizome underneath is constantly sending up new "pups" or shoots. Removing the old, spent stems makes room for these fresh, vibrant new stalks to take over.
Cleaning the Leaves
Because canna leaves are so large, they can collect dust over time. Dust can block sunlight and make it harder for the plant to breathe. Every few weeks, gently wipe the leaves with a damp cloth to keep them clean and shiny.
Choosing the Best Varieties for Indoor Growing
While any canna can technically grow indoors, some are much easier to manage in a home setting than others. Some cannas can reach seven or eight feet tall, which might be a bit much for the average living room!
We recommend looking for dwarf or compact varieties for indoor growth. These typically top out at two to three feet, making them much more manageable for windowsills and plant stands.
- The Canna Sol Series: These are bred specifically for container living. They stay compact, have a very high flower count, and come in a wide range of colors.
- Dwarf Varieties: Look for names that include words like "Baby" or "Puck." These are naturally shorter and won't require as much vertical space.
- Foliage-Focused Cannas: If you love the look of the leaves more than the flowers, varieties with variegated or dark bronze foliage are stunning even when they aren't in bloom. For larger plants with the same tropical style, browse our Tall Cannas collection or the Assorted Cannas collection.
Managing the Seasonal Transition
If you plan to move your indoor-started cannas outside for the summer, you must do so gradually. This process is called "hardening off." Plants grown indoors are soft and pampered; if you move them directly into the hot sun and wind, their leaves will likely scorch or tear.
Start by placing the pots in a shaded, protected spot outdoors for an hour or two each day. Gradually increase their time outside and their exposure to sunlight over the course of 10 to 14 days. Once the nights are consistently above 50°F and the plants have toughened up, you can leave them outside for the season or transplant them into your garden beds.
What to Do Next:
- Select a pot that is at least 12 inches wide with good drainage.
- Choose a compact variety like a dwarf canna for easier indoor management.
- Place your pot in the sunniest window in your home.
- Keep the soil consistently moist—don't let it dry out completely.
Troubleshooting Common Indoor Issues
Even with the best care, you might run into a few hurdles. Here is how to handle the most common issues with indoor cannas. If you ever have an order-related question, the About Us page explains Longfield Gardens’ 100% quality guarantee.
Pests
Spider mites are the most common pest for indoor cannas, especially in dry winter air. You might notice tiny webs or yellow speckling on the leaves. To prevent them, keep the humidity high and occasionally mist the leaves. If you see an infestation, you can wash the leaves with a gentle insecticidal soap.
Fungus gnats can also appear if the soil is kept very wet. These are small black flies that hover around the soil. To manage them, you can let the very top layer of soil dry out slightly between waterings or use yellow sticky traps.
No Blooms
If your canna is growing plenty of leaves but no flowers, the most likely culprit is a lack of light. Cannas need a lot of energy to produce those big, showy blooms. Try moving the plant to a brighter window or adding a grow light. Lack of fertilizer can also play a role, so ensure you are sticking to a regular feeding schedule.
Yellowing Leaves
If the lower leaves turn yellow and die, it’s often just a natural part of the plant’s life cycle. As new leaves grow from the center, the old ones on the outside eventually fade. However, if the whole plant is yellowing, it could be a sign of overwatering (leading to root rot) or a nutrient deficiency. Ensure your pot is draining well and that you are using a balanced fertilizer.
Conclusion
Growing canna lilies indoors is a rewarding way to enjoy a tropical atmosphere throughout the year. These resilient plants ask for very little—just a bright spot, a drink of water, and a little food—to reward you with some of the most dramatic foliage and flowers in the botanical world. At Longfield Gardens, we want every gardener to feel confident experimenting with their favorite plants. By following these simple rules for light, water, and space, you can turn any sunny corner of your home into a lush, vibrant sanctuary.
The most important thing to remember is that gardening is a journey. Your canna will tell you what it needs through its leaves and growth habits. Pay attention, stay consistent, and enjoy the process of bringing the beauty of the outdoors inside.
"Cannas are the ultimate 'effort-to-reward' plant. With just a few basic needs met, they provide a massive visual impact that few other houseplants can match."
FAQ
Do canna lilies need a dormant period if kept indoors?
No, canna lilies do not require a dormant period. Unlike many bulbs that need a cold rest to bloom again, cannas are tropical plants that can grow and flower continuously as long as they are kept in a warm environment with sufficient light and water.
Can I grow canna lilies from seed indoors?
Yes, you can grow them from seed, but it takes more patience than growing from rhizomes. Canna seeds have a very hard coat, so you usually need to nick the seed with a file and soak it in water for 24 hours before planting. Seed-grown plants may take a year or more to produce their first flowers.
Why are the leaves on my indoor canna turning brown at the edges?
Brown, crispy edges are usually a sign of low humidity or underwatering. Indoor air can be very dry, especially during the winter. Try placing the pot on a humidity tray or using a room humidifier to keep the air around the plant moist.
How big will my canna lily get inside?
The size depends entirely on the variety you choose. Standard cannas can reach 5 to 8 feet tall, which is usually too big for indoors. However, dwarf or compact varieties typically stay between 2 and 3 feet tall, making them perfect for indoor containers.