How to plant water lilies in a natural pond: soil bottom, deep water, and planting without draining

Planting a water lily in an 80 cm lined pond is a ten-minute job. Planting it in a pond covering several hundred square meters, with a soil or clay bottom, a meter and a half of murky water, and silt whose end you cannot see, is another matter. You do not drain a pond to place three baskets. In a pond, the key comes down to three decisions: choose a variety vigorous enough for the actual depth, weigh the plant down so it reaches the bottom the right way up, and protect it during the first season.

Pond or basin: what changes for the water lily

In a garden pond, everything is under control: regular shelves, clear water, no silt, and you can bring a basket back up in two minutes. A natural pond imposes different rules. The bottom is often soft, sometimes covered with several dozen centimeters of organic sediment. The depth varies from one place to another and from one season to another, with the water table level or rainfall. The water is rarely clear, making it impossible to see where the plant lands. And there is wildlife: carp rummaging through the bottom, ducks, rodents.

The water lily, for its part, has not changed its requirements. It needs direct sunlight for a good part of the day, calm water without jets or currents, and a water depth above the rootstock that matches its vigor. Wetzel reminds us in his treatise on limnology that rooted plants with floating leaves occupy a fairly narrow depth range: too little water and the leaves rise out of the water; too much water and the petioles become exhausted trying to reach the surface.

Measure first, then choose the variety

Before buying, take a graduated pole or a weighted rope and sound the intended location at several points. Note the depth of open water, then push the pole in to estimate the thickness of soft silt. What matters is the water depth above the plant's crown once it has been placed.

In a pond, a common mistake is to buy a dwarf water lily because its flowers are pretty, then place it in a meter of water. It struggles for two years, then disappears. Conversely, a very vigorous plant in a small pond eventually ends up covering the entire surface.

Three ways to plant without emptying the pond

1. The large weighted basket, lowered by rope

This is the safest method. Use a wide, heavy basket at least 30 to 40 cm in diameter, filled with clay soil or aquatic potting soil, with the rootstock laid flat and the bud exposed. Cover with gravel so the fish do not scatter the soil. Pass two ropes under the basket, crossing them, and lower it slowly from the bank, a pontoon, or a boat. The basket must touch the bottom flat. Once it is in place, remove the ropes by pulling on just one end.

2. The root ball in burlap

Traditional method for large bodies of water: place the rootstock on a large ball of heavy, clay-rich soil, with one or two stones at the center for weight, then wrap everything in a square of burlap tied above, leaving the bud exposed. Throw or place the bundle at the chosen location. The burlap decomposes within a season, and the roots colonize the bottom. This is economical and suitable for ponds with earthen bottoms, but the plant can no longer be easily retrieved afterward.

3. Direct planting in shallow water

In a pond with a clay bottom, where the water is no more than about fifty centimeters deep, or when water levels are low at the end of summer, the rhizome can be pushed directly into the bottom by hand or foot, held in place by a flat stone placed beside it, never on the bud. This does not work in very liquid sediment: the root sinks too deeply and suffocates.

Gradual lowering, pond version

In a garden pond, it is recommended to place the basket on bricks first, with the leaves at the surface, then lower it in stages. In a pond, the bricks sink into the sediment, and no one is going to dive every three weeks. Two alternatives work well. Either plant it first in a shallow cove and move the basket at the end of the season, or buy an already established plant with stems long enough to reach the surface from the bottom, avoiding the intermediate step. For young roots, the first solution remains the most reliable.

Specific pond pests

Failures in ponds are rarely caused by the planting itself. They are caused by what happens afterward.

• Carp and large cyprinids rummage through the bottom and unearth young roots. Thick gravel on the basket and a few stones around it help limit the damage.
• Ducks pull up young leaves in spring. A net stretched over the planted area for a few weeks is often sufficient.
• Rodents, especially muskrats and coypus, eat the rhizomes. These two species are listed as invasive alien species under Regulation (EU) 1143/2014; their control falls to the relevant authorities, not private individuals.
• Thick, oxygen-poor sediment can cause a root to rot if placed directly on the bottom. Hence the benefit of the basket, which keeps the rhizome above the softest layer.

In a pond, one well-chosen and properly weighted water lily is better than five roots thrown in at random. Scheffer also shows that established vegetation helps stabilize the water in shallow bodies of water: every plant that takes root matters.

What soil should be used at the bottom of a pond?

Never use regular horticultural potting soil: it is light, floats, and releases nutrients that feed algae. You need heavy, clay-rich soil low in fresh organic matter, or soil specially designed for water lilies. A slow-release fertilizer placed at the base in spring is then sufficient. In a pond, the surrounding mud will provide the rest once the roots have grown out of the basket.

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Frequently asked questions

— Can you plant a water lily in a pond without a basket?

Yes, in a clay bottom and shallow water, or with a weighted burlap root ball. In soft, thick mud, a basket is preferable.

— What is the best time to plant in a pond?

From late April to July, once the water has warmed up. Late planting is still possible, but the plant will have less time to establish before winter.

— Why isn't my water lily coming back up to the surface?

Most often, it is too deep for its vigor, or it was placed upside down in the mud. Move it to a shallower area or choose a more vigorous variety.

— How many water lilies for a pond?

Aim for coverage of about one-third to one-half of the surface area once established, no more, to leave light for other plants and open water for fish.

In summary

• Check the depth and mud before choosing the variety.
• Plant from late April to July, in full sun and still water.
• A heavy basket or burlap root ball, well weighted down and lowered by rope.
• Protect them from carp, ducks, and rodents during the first season.

Last updated: September 29, 2026.