Generally speaking, ponds need at least 6 hours of direct sunlight per day to support healthy plant growth and photosynthesis. However, some plants, such as water lilies, may need more light, while others, like cattails, can tolerate less light.
If a pond does not receive enough light, the plants will not be able to photosynthesize and produce oxygen, which can lead to poor water quality and an unhealthy environment for the animals that live in the pond. Additionally, low light levels can also make it difficult for predators to find food, which can disrupt the pond's ecosystem.
To ensure that a pond receives enough light, it is important to consider the location and size of the pond, as well as the surrounding vegetation. Ponds that are located in shady areas or that are surrounded by tall trees or buildings may not receive enough light to support healthy plant growth. To account for this, it may be necessary to trim back or remove vegetation that is blocking sunlight.
It is also important to choose plants that are appropriate for the light conditions of the pond. Plants that are adapted to low light conditions, such as water lilies and cattails, can be used to create a beautiful and healthy pond even in shady areas.