Canna lilies, also known as Canna glauca or water canna, can be a beautiful addition to any garden or landscape. However, there is some debate about whether or not they are invasive. In my experience as a gardening and landscaping expert, I have found that Canna glauca is not overly invasive if properly managed.
One way to control the spread of canna lilies is by growing them in pots. By keeping them contained in a pot, you can prevent them from spreading throughout your garden or landscape. This is especially important if you have a smaller garden or limited space.
When growing canna lilies in pots, it’s important to choose a pot that is large enough to accommodate the plant’s root system. Canna lilies have large, fleshy roots, so a deeper pot is preferable. Additionally, using a well-draining potting mix will help to prevent waterlogged soil, which can lead to root rot.
To further control the spread of canna lilies, you can “plunge” the pot into the soil. This means partially burying the pot in the ground, leaving the top few inches of the pot exposed. This allows the canna lily to grow and spread within the confines of the pot, while still providing stability and support.
Another method to prevent the spread of canna lilies is by regularly dividing and thinning the plants. Over time, canna lilies can become overcrowded, which can lead to stunted growth and decreased flowering. By dividing the plants every few years, you can rejuvenate them and prevent them from taking over your garden.
In terms of overall invasiveness, it’s important to note that canna lilies are not classified as invasive in most regions. They are native to tropical and subtropical regions, so they may not be suited for colder climates. However, in warmer regions where they can thrive, they may spread and naturalize in certain situations.
In my personal experience, I have found that canna lilies can be quite well-behaved if given the right conditions and proper care. I have grown them in pots and have not had any issues with them spreading beyond their designated area. By following the tips mentioned above, I have successfully managed the growth and spread of canna lilies in my own garden.
While canna lilies have the potential to spread and naturalize in certain situations, they can be controlled and managed with proper care and containment. By growing them in pots and regularly dividing and thinning the plants, you can enjoy the beauty of canna lilies without the worry of them becoming invasive.
