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Cannas lilies can grow in water, but not all canna lilies thrive equally well when grown this way.
While some varieties adapt beautifully to water gardens or boggy conditions, others prefer traditional soil planting for optimal growth and flowering.
If you’ve been wondering, “Can all canna lilies grow in water?” you’re in the right place.
In this post, we’ll explore which canna lilies can grow in water, how to care for them if you try growing them hydroponically or in aquatic settings, and what varieties are better suited to dry soil.
Let’s dive into the watery world of canna lilies and find out if yours can make a splash!
Why Some Canna Lilies Can Grow in Water
Canna lilies can grow in water because many species naturally thrive in moist or swampy environments.
This natural affinity for wet habitats means that they can tolerate, and sometimes even prefer, growing in waterlogged soil or shallow water.
1. Natural Habitat Is Wet and Swampy
Many canna lilies originate from tropical and subtropical regions where wet conditions are common.
In their native environments, they often grow along riverbanks, wetlands, or marshy areas where water is abundant.
This evolutionary background equips them to survive, and even flourish, in water or soggy soil.
2. Rhizomes Adapted to Moist Conditions
Canna lilies grow from rhizomes, which are thick horizontal underground stems.
These rhizomes can tolerate saturated soil, and even standing water for some period, which allows the plant to access oxygen and nutrients in aquatic environments.
Because of this, canna lilies often do well when partially submerged in water containers or water gardens.
3. Ability to Absorb Nutrients in Water
Canna lilies can absorb nutrients effectively through their roots even when they’re submerged or in very wet soil.
This makes them suitable for hydroponic setups or water gardens where the roots are constantly in contact with water instead of dry soil.
Which Canna Lilies Can Grow in Water?
While many canna lilies can handle water, not all varieties are ideal for growing fully in water-based environments.
Let’s take a look at which types are most suited to growing in water and which ones you might want to keep in soil.
1. Aquatic or Bog-Adapted Cannas
Certain canna varieties are known as “aquatic” or “bog” cannas.
These are naturally adapted to very wet conditions and can be grown in water gardens, ponds, or containers with standing water.
Examples include Canna indica, which is often found in swampy places and can tolerate water depths of a few inches.
2. Common Garden Cannas (Canna x generalis)
Popular garden cannas typically grow well in moist soil but don’t necessarily do well submerged fully in water.
They prefer keeping their rhizomes just moist but not underwater all the time.
These varieties are best planted in well-drained soil or garden beds with rich moisture.
3. Dwarf and Ornamental Cannas
Smaller or ornamental canna cultivars, while beautiful, generally don’t do as well in water-based growing conditions.
Their roots are less tolerant of standing water, which can lead to rot if kept submerged for long periods.
For these varieties, moist soil or container planting with regular watering is a safer choice.
How to Grow Canna Lilies in Water Successfully
If you want to grow canna lilies in water, it’s important to know how to set up their environment properly to avoid root rot and other issues.
1. Use Shallow Water with Good Aeration
Canna lilies in water prefer shallow water depths, usually just a few inches covering the rhizomes and roots.
Ensure there’s good water movement or occasional fresh water to prevent stagnation, which can suffocate the roots.
2. Choose Suitable Containers or Water Gardens
Plant canna lilies in wide, open containers or ponds so roots have room to spread.
Containers with holes at the base submerged in water or using aquatic planting baskets work well to keep roots moist but not overly saturated.
3. Provide Nutrient-Rich Water
Since canna lilies rely on their roots for nutrients, it’s essential to feed them regularly when growing in water.
Use a balanced liquid fertilizer diluted properly to avoid burning roots.
Aquatic plant fertilizers are a good choice.
4. Monitor Water Temperature and Light
Canna lilies enjoy warm environments and plenty of sunlight.
Keep the water temperature above 60°F (15°C) for healthy growth and ensure they get at least 6 hours of direct sunlight daily.
5. Watch for Signs of Stress
Yellowing leaves or mushy rhizomes are signs the canna lily isn’t happy in water.
If roots look brown or smell rotten, reduce water depth or improve aeration.
Sometimes switching to moist soil conditions is best if problems persist.
Which Canna Lilies Should Not Be Grown Fully in Water?
Understanding which canna lilies don’t tolerate full water growth can save you frustration and keep your garden thriving.
1. Varieties Preferring Well-Drained Soil
Some canna cultivars require well-drained soil and will suffer root rot in water.
These include many hybrid garden cannas bred for large flowers but less tolerant of soggy roots.
2. Dwarf Cannas with Delicate Rhizomes
Smaller-size cannas have thinner rhizomes that are prone to rot if submerged.
They do better in pots or beds with moist but not waterlogged soil.
3. Cannas in Cold Climate Zones
In areas with cold winters, canna lilies are often lifted and stored indoors.
Growing them in water indoors can work temporarily, but outdoors only those varieties that tolerate moisture extremes should stay in water.
So, Can All Canna Lilies Grow in Water?
Not all canna lilies can grow in water successfully.
While many varieties, especially native aquatic types like Canna indica, can thrive in water or very moist conditions, others need well-drained, moist soil to prevent root rot and support healthy growth.
Your best bet is to pick water-tolerant canna lilies if you want to cultivate them in ponds, water gardens, or containers with standing water.
If you have ornamental or dwarf cannas, sticking to soil or moist garden beds will give you better results and more vibrant blooms.
By understanding the water tolerance of your canna lily variety and providing the right growing conditions, you can enjoy their spectacular flowers whether in soil or floating in a water garden.
Happy gardening with your canna lilies in water or on dry land!