Table of Contents
- Introduction
- The Short Answer: Yes, June is a Great Time
- Why Soil Temperature Matters More Than the Date
- What to Expect from June-Planted Cannas
- Choosing the Right Spot for Your Summer Cannas
- How to Plant Canna Rhizomes in June
- Growing Cannas in Containers
- Caring for Your Cannas Through the Summer
- Landscape Ideas for Late-Season Planting
- Managing Pests and Challenges
- Preparing for the End of the Season
- Conclusion
- FAQ
Introduction
There is nothing quite like the sight of a canna lily in full bloom to make a backyard feel like a private tropical getaway. With their oversized, banana-like leaves and brilliant jewel-toned flowers, these plants bring a sense of drama and energy to the garden that few other perennials can match. Many gardeners find themselves wondering if they have missed the window for these summer stars once the calendar turns to June.
At Longfield Gardens, we believe every gardener should experience the joy of growing Tall Cannas from a simple rhizome into a towering focal point. Whether you are a busy person who just found time to get into the garden or you live in a northern climate where spring arrives late, June is a fantastic time to get started. This guide will help you understand why planting in early summer works so well and how to ensure your cannas thrive throughout the season.
Whether you are looking to fill a large landscape bed or add a pop of color to a patio container, Spring-Planted Summer-Blooming Bulbs are an easy win. You can still enjoy a spectacular show of foliage and flowers before the first frost arrives. Planting canna bulbs in June is not only possible but often leads to rapid, impressive growth thanks to the warm summer soil.
The Short Answer: Yes, June is a Great Time
The most common question we hear this time of year is whether it is too late to plant cannas. The simple answer is no. In many parts of the country, June is actually one of the best times to put canna rhizomes in the ground. These plants are native to tropical and subtropical regions, which means they are built to thrive in the heat.
While many spring-blooming bulbs like tulips or daffodils require cold soil to develop, cannas are exactly the opposite. They wait for the sun to warm the earth before they even consider waking up. If you plant a canna in April in a cold, damp climate, the rhizome might sit dormant for weeks, risking rot. By June, the soil temperature has usually reached the magic number of 65°F, which acts like a green light for growth.
When you plant in June, you are working with nature instead of against it. The warm air and soil provide the perfect environment for the rhizome to sprout quickly. Instead of waiting several weeks for the first green shoot to appear, you might see growth in as little as ten days. This fast start helps the plant catch up and find its place in your summer garden design.
Key Takeaway: June planting is highly successful because cannas are heat-loving plants that grow much faster in warm summer soil than in the cool soil of early spring.
Why Soil Temperature Matters More Than the Date
Successful gardening often comes down to timing rather than a specific date on the calendar. For canna lilies, soil temperature is the single most important factor for success. These plants are very sensitive to cold. Even if the air feels warm on a sunny May afternoon, the soil can remain chilly several inches down where the rhizome sits.
In USDA zones 4, 5, and 6, the ground often takes until late May or early June to truly warm up. If you're not sure which zone you live in, the USDA Hardiness Zone map is a helpful reference. This is why northern gardeners often find that June-planted cannas perform just as well as those planted earlier. A rhizome planted in June in warm soil will often overtake a plant that was put in the ground in early May when the conditions were less than ideal.
Waiting for June also eliminates the risk of a late-spring frost. A surprise cold snap can damage or kill tender new canna shoots that have just emerged from the ground. By the time June arrives, the danger of frost has passed in almost every part of the United States. This gives you peace of mind that your new plants will have a safe, warm environment to start their journey.
Checking Your Soil Temperature
If you want to be precise, you can check your soil temperature with a simple garden thermometer. Aim for a consistent reading of at least 60°F to 65°F. If you do not have a thermometer, a good rule of thumb is that if the soil is warm enough to plant tomatoes or peppers comfortably, it is warm enough for your cannas.
Benefits of the June "Jump Start"
- Rapid Sprouting: Warm soil triggers faster metabolic activity in the rhizome.
- Stronger Roots: Roots establish quickly when they don't have to fight cold, wet conditions.
- Less Maintenance: You won't need to worry about covering plants during late-season cold snaps.
What to Expect from June-Planted Cannas
One common concern with planting in June is whether the plants will have enough time to bloom. Because cannas grow so quickly once the heat of summer hits, they are usually able to reach their full height and produce flowers before the season ends. Most varieties will begin to bloom about 60 to 90 days after planting.
If you plant in early June, you can expect to see flowers starting in August. These blooms will often continue right up until the first frost of autumn. In fact, many gardeners find that cannas look their best in the late summer and early fall when other garden favorites are beginning to fade. Their bold colors and tropical leaves provide a much-needed boost of energy to the landscape during the hottest months.
Even if your growing season is short, the foliage of a canna lily is a reward in itself. Varieties like Pretoria feature stunning yellow and green striped leaves,
while others like Tropicanna offer dark, moody burgundy and bronze tones. Even without flowers, these plants act as a living sculpture in the garden, providing height and texture that lasts all season long.
Choosing the Right Spot for Your Summer Cannas
Since you are starting a little later in the season, giving your cannas the best possible location is key to helping them catch up. They are not shy about their needs: they want sun, water, and rich soil.
The Power of Full Sun
Cannas are solar-powered. To get the most vibrant flower colors and the tallest stalks, you should choose a spot that receives at least six to eight hours of direct sunlight each day. While they can grow in partial shade, they will likely be shorter and produce fewer flowers. In the heat of June and July, the sun provides the energy they need to grow several inches in a single week.
Soil and Drainage
These plants are unique because they love moisture but do not like to sit in stagnant, waterlogged soil. They are often used near ponds or in rain gardens because they can handle "wet feet" better than many other bulbs. However, if you are planting in a standard garden bed, make sure the soil is rich in organic matter. Adding a little compost to the planting hole is a simple way to provide the nutrients and drainage they prefer.
Wind Protection
Because cannas can grow quite tall—some varieties reach six feet or more—their large leaves can act like sails in a strong wind. If you live in a particularly breezy area, consider planting them near a fence, a wall, or a group of sturdy shrubs. This helps protect the beautiful foliage from tearing and prevents the tall flower stalks from leaning.
How to Plant Canna Rhizomes in June
Planting cannas is a straightforward process that does not require any special tools. Getting the depth and spacing right is the best way to ensure your plants have the room they need to reach their full potential.
Step 1: Prepare the Soil
Start by loosening the soil in your chosen spot to a depth of about eight inches. This makes it easy for the new roots to spread out and anchor the plant. If your soil is very heavy clay or very sandy, mix in a few handfuls of compost to improve the texture.
Step 2: Dig and Drop
Dig a hole that is about 2 to 4 inches deep, the same depth recommended in our How Deep to Plant a Canna Bulb guide. Place the canna rhizome horizontally into the hole. If you look closely at the rhizome, you will see small bumps or points called "eyes." These are the growing tips where the new shoots will emerge. Point these eyes upward if possible, but don't worry too much—cannas are smart enough to find the light even if they are planted sideways.
Step 3: Spacing
Cannas like a bit of elbow room. If you are planting tall varieties, space the rhizomes about 18 to 24 inches apart. For dwarf or medium-sized varieties, 12 inches is usually sufficient. For more spacing tips, see How Far Apart Do You Plant Canna Bulbs. Giving them enough space ensures good air circulation, which keeps the foliage healthy and prevents the plants from competing for water and nutrients.
Step 4: Water Well
Immediately after covering the rhizome with soil, give the area a good soaking. This settles the soil around the rhizome and eliminates air pockets. Once they are in the ground, we recommend keeping the soil consistently moist. Unlike some bulbs that prefer to dry out between waterings, cannas are thirsty plants that appreciate a regular drink.
What to Do Next:
- Select a sun-drenched spot in your yard.
- Loosen the soil and add a bit of compost.
- Plant rhizomes 3 inches deep and 18 inches apart.
- Water thoroughly to start the growing process.
Growing Cannas in Containers
If you don't have space in your garden beds, or if you want to decorate a porch or patio, June is a perfect time to plant cannas in containers. Growing in pots allows you to move the plants around to catch the best sun, and the soil in a container often warms up even faster than the ground.
When choosing a container, go big. Cannas have vigorous root systems and can become top-heavy as they grow. A sturdy pot that is at least 12 to 15 inches in diameter is a good starting point for a single plant. Ensure the pot has plenty of drainage holes at the bottom. For more ideas, see How to Grow Summer Bulbs in Containers.
Use a high-quality potting mix rather than garden soil. Potting mix is lighter and designed to provide the right balance of air and moisture for container plants. Because plants in pots dry out faster than those in the ground, you may need to water your container cannas every day during the heat of July and August.
Container Combinations
Cannas make a fantastic "thriller" in the center of a mixed container. You can surround them with "spiller" plants like trailing petunias or sweet potato vines. The contrast between the tall, upright canna leaves and the soft, draping flowers creates a professional look with very little effort.
Caring for Your Cannas Through the Summer
Once your June-planted cannas are up and growing, they are relatively low-maintenance. A few simple steps will keep them looking their best until the first frost. For a broader look at planning and growing them, see All About Cannas.
Consistent Moisture
The secret to those lush, tropical leaves is water. Cannas do not like to dry out. If the soil becomes too dry, the leaves may begin to crack or the edges might turn brown. During the peak of summer, aim to give them a deep watering once or twice a week, depending on your local rainfall.
Feeding the Giants
Cannas are "hungry" plants. Because they grow so much biomass in a single season, they require plenty of fuel. We recommend applying a balanced, slow-release fertilizer in mid-summer to support their growth and flower production. Alternatively, you can use a water-soluble fertilizer every few weeks when you water.
Deadheading for More Blooms
To keep the flowers coming, practice "deadheading." This simply means cutting off the faded flower spikes. When a flower stalk has finished blooming, cut it back to the next set of leaves. This prevents the plant from putting energy into producing seeds and encourages it to send up new flower stalks instead.
Landscape Ideas for Late-Season Planting
June planting gives you a chance to see where your garden has "holes" that need filling. By early summer, some of your earlier perennials might have finished blooming, leaving a gap in the landscape. Cannas are the perfect solution for these spots. For more inspiration, see Fresh Ideas for Growing Cannas.
Creating a Living Screen
Because they grow so tall and thick, cannas make an excellent temporary privacy screen. If you have a patio that feels a bit too exposed to the neighbors, a row of June-planted cannas can create a lush, green wall by August. This provides privacy exactly when you are spending the most time outdoors.
Adding Height to Borders
Most garden plants are relatively low to the ground. Cannas add much-needed vertical interest. Planting them at the back of a flower border creates a beautiful backdrop for shorter annuals and perennials. Their architectural shape makes the whole garden look more structured and intentional.
Attracting Pollinators
If you love watching hummingbirds, cannas are a must-have. Their bright red, orange, and yellow tubular flowers are specifically designed to attract these tiny birds. Planting cannas in June ensures you have a reliable food source for hummingbirds and butterflies as they prepare for their late-summer migrations.
Managing Pests and Challenges
While cannas are generally robust and healthy, they can occasionally run into a few minor issues. Being aware of these can help you act quickly to keep your plants looking great.
Slugs and Snails
In early summer, slugs and snails may be attracted to the tender new shoots of your cannas. You might notice small, irregular holes in the leaves. A simple way to manage this is to clear away any dead leaves or debris from the base of the plants where these pests like to hide.
Japanese Beetles
In some regions, Japanese beetles may take a liking to canna flowers in July. If you see them, the easiest method is to hand-pick them and drop them into a bucket of soapy water. Because cannas grow so vigorously, they can usually handle a bit of minor insect damage without it affecting the overall health of the plant.
Leaf Rollers
Occasionally, a small caterpillar known as a leaf roller might try to zip the edges of a leaf together to create a hiding spot. If you see a leaf that looks like it is being rolled up like a cigar, simply unroll it and remove the caterpillar. Keeping your plants healthy with plenty of water and sun is the best defense against any pest.
Preparing for the End of the Season
As the summer winds down, your June-planted cannas will still be going strong. In fact, many people find they are at their most beautiful right before the weather turns cold. If you need help planning your order, our shipping information page explains how shipping is timed by zone.
In warmer climates (USDA zones 8 to 11), cannas are perennials that can stay in the ground all year. You simply cut back the foliage after it yellows and wait for them to return in the spring. In cooler climates (zones 3 to 7), cannas are treated as annuals, or the rhizomes can be dug up and stored indoors for the winter.
Wait until the first frost has blackened the leaves before you do anything. This frost sends a signal to the plant to move its energy down into the rhizome for storage. Once this happens, you can cut the stalks down to about four inches and decide whether to compost the roots or save them for next year.
Pro Tip: If you live in a cold area, storing canna rhizomes is a fun and rewarding way to expand your garden for free. They often multiply during the summer, so you might have twice as many to plant next year!
Conclusion
Planting canna bulbs in June is a wonderful way to bring a burst of tropical color and impressive height to your summer garden. By taking advantage of the warm soil and long sunny days, these resilient plants quickly catch up and provide a stunning display that lasts until the first frost. We at Longfield Gardens are committed to helping you succeed with high-quality rhizomes and practical advice that makes gardening feel like a rewarding adventure rather than a chore.
The most important thing to remember is that gardening is about enjoying the process and the beauty of nature. Whether you are planting your very first canna or adding to a growing collection, the result is sure to be a show-stopper. If you want to keep building the display, browse Shop All Spring-Planted Bulbs for more heat-loving options.
For gardeners who like to plan by palette, Spring Planted Bulbs By Color can help you choose the right mix of blooms for your space.
Longfield Gardens stands behind every order with our 100% Quality Guarantee, so you can plant with confidence.
"The secret to canna success is simple: wait for the heat, plant with the 'eyes' up, and keep the water coming. Your garden will be transformed into a tropical paradise before you know it."
FAQ
Will my cannas bloom this year if I plant them in June?
Yes, in most regions, cannas planted in June will have plenty of time to bloom. Because they grow so rapidly in warm summer weather, they usually reach maturity and begin flowering within 60 to 90 days. You can expect a beautiful display of flowers starting in late August or early September and continuing until the first frost.
Do I need to soak canna rhizomes before planting them in June?
Soaking is not strictly necessary, but it can help "wake up" a rhizome that has become very dry during storage. If your rhizomes feel light or shriveled, you can soak them in a bucket of lukewarm water for a few hours before planting. However, if they feel firm and plump, you can put them straight into the warm June soil.
How often should I water cannas planted in early summer?
Cannas love moisture and should be watered whenever the top inch of soil feels dry. In the heat of June and July, this usually means a deep watering once or twice a week for garden beds. If you are growing them in containers, you may need to water them every day to keep the soil consistently damp.
Can I plant cannas in pots in June instead of the ground?
Absolutely. June is a perfect time for container planting because the soil in pots warms up very quickly. This warm environment encourages fast sprouting. Just make sure to use a large, heavy pot with good drainage, as cannas grow quickly and can become quite large by the end of the summer.