Aquatic Plants


Grow your know-how with a little horticultural help!

The Pond Clinic Water Garden Centre features eastern Ontario’s largest aquatic plant nursery. From lilies and lotus to submerged oxygenators and stunning marginal plants, we carry everything you need for your blue thumb!

Aquatic Plants are the living, breathing filters of your natural eco- system pond. They aren’t just beautiful, they are absolutely necessary to create and sustain the perfect balance found in Mother Nature. The Pond Clinic offers every plant listed in this section, and encourage you to read over the plant care and requirements for each type aquatic plant.


Hardy Water Lily

Hardy water lilies are ideal for any water garden because of their perennial beauty, ease of culture, wealth of bloom, and range of colour and form. They grow readily when provided with sunlight, rich soil, warm water, and are exceptionally hardy. Their purchase may be considered a permanent investment, with reasonable care they can be retained for many years. Hardy water lilies should be fertilized each spring and on every holiday weekend throughout the summer to encourage blooming and strong growth. Dividing and re-potting them every 2-3 years will prevent the plants from becoming root bound which can stunt growth and reduce blooming.

Hardy Water Lily Varieties
Click on an image below to view the varieties













Hardy Marginal

Hardy marginal plants are grown in the shallow areas of your pond also referred to as the ‘margins’. They are great hiding places for amphibians, beneficial insects and small fish, and they create a fabulous transition between your pond and the surrounding gardens. Hardy marginal plants are also perfectly suited for Rain Gardens and Constructed Wetlands. Fertilize potted marginals each spring to encourage growth and bloom.

Floating Plants

These plants grow simply by floating on the water surface. They do not require planting or watering, obviously! These plants help control algae by shading the water and utilizing dissolved nutrients that would otherwise encourage algae growth. At least 25% of your pond should be covered with a combination of floating plants and water lilies. They should be treated as annuals as they are considered tropical and they overwinter very poorly indoors due to lack of sunlight.


Every pool needs oxygenating plants. These plants grow under water similar to plants you see growing naturally in ponds and lakes. They absorb excess nutrients from the water and liberate oxygen during the day, which helps to clear the water and helps to prevent the growth of algae that cause green water. Oxygenating plants are indispensable when fish are present, as they set up a balanced or natural condition of the water. They also will assist materially in raising a hatch of baby fish, as the young fish find much needed shelter and protection among the foliage. While not all submerged oxygenators are hardy, those that are don’t need much help in the spring, to bounce back into action!

Tropical Marginal

While tropical marginal plants do require more work than their hardy cousins, they can add a spectacular splash of colour to your water garden, making them well worth the effort. Tropical marginal water and bog plants are available in 4″ nursery containers, but they should be transplanted into 8″ pots or fabric baskets to encourage vigorous growth. Keep in mind that wide based pots are more stable for tall plants. Fertilize monthly to encourage growth and blooms. Keep them in their pots, for ease of transfer when it’s time to bring them inside for the colder weather.


Lotus, the sacred flower of the Hindus, produces round aerial leaves that stand 18″ to 4′ above the water. The exotic fragrant blossoms produce the unusual seed pod seen in many flower arrangements. Lotuses require many weeks of sunny, warm weather, large containers and rich soil in order to bloom well, although they are HARDY to Zone 5. Sometimes they produce only aerial leaves in their first year. They will spread rapidly in natural ponds if planted deep enough to protect the rhizome from freezing. We offer potted lotuses in 27L containers from May to September. In the spring, lotus tubs should be placed so 1″ to 2″ of water is above the top of the tub. If you do not have an Aquascape pond with marginal shelves, blocks may be needed to raise the tubs up in deeper areas. This allows for more sunlight and heat to stimulate growth. As growth becomes established with aerial leaves, water depth may be increased to 6″ or 8″ of water above the top of the tub. Similar to lilies, lotuses should not be placed close to waterfalls or fountains where they will be splashed. Lotus are heavy feeders and should be fertilized once a month with 4 to 6 fertilizer tablets from April to August, for maximum growth and bloom. Tip: Lotuses flourish in hot sunny locations. Try planting them as patio accents in ceramic containers and pots. They’ll bloom quicker and longer.

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