A waterlily can grow in a suitable aquatic container or, in some pond designs, in an appropriate planting area on the bottom. The choice is less about which looks natural and more about how you will manage root growth, reach the plant, and care for it as it matures. Check the specific variety's planting depth and growing instructions before choosing either method.
Why a container is often practical
A roomy aquatic planter helps keep the planting medium and roots in a defined area. You can reposition the plant if its light or depth is wrong, and lifting a container makes repotting or division more manageable. Choose a size for the mature variety, not merely the small pot in which it was sold. A cramped container can limit growth, while a poorly chosen medium may cloud the water.
What changes with bottom planting?
Planting directly into an appropriate pond-bottom area removes the container as a boundary. That can make later root control, division, and relocation more difficult. Not every pond has a suitable planting substrate or safe access to the bottom; do not cut through or disturb a lined pond to create a planting pocket without a design that supports it. Consider how you would reach the plant when it needs care, not just where it sits on planting day.
Compare care before deciding
Can you move the lily to match its required depth and sun? Can you remove spent growth and divide the plant without disturbing fish, liner, or plumbing? Where will planting media and any label-approved aquatic fertilizer stay? Answers vary with pond construction and waterlily variety. When uncertain, a suitable container is often the easier-to-adjust starting point.
Use the plant's own directions
Waterlilies differ in mature spread, hardiness, light needs, and preferred depth. Follow the current plant instructions for your variety and the instructions for any medium or fertilizer you use. For the planting sequence and common mistakes, read How to Plant a Waterlily in a Pond (and Mistakes to Avoid). For choosing plants by role, see How to Choose Pond Plants for Your Water Garden.