Is garden soil or clayey sandy suitable for a small pond to be dug into?

Clayey sandy soil has a higher clay content than garden soil, which makes it more compact and less likely to erode. This is important for a pond because it helps to prevent the water from seeping away and the sides of the pond from collapsing.

Garden soil, on the other hand, is more likely to erode and may not be able to support the weight of the water in the pond. Additionally, garden soil may contain more organic matter than clayey sandy soil, which can decompose and release nutrients into the water, leading to algae growth and other water quality problems.

Therefore, clayey sandy soil is the better choice for a small pond.