Which plant can be used to waterproof basket containers?

Moss is an ideal choice for waterproofing basket containers due to its natural properties. When used inside a basket, moss creates a barrier that helps retain moisture while preventing soil from leaking out. This is particularly effective in ensuring that the plant's roots stay hydrated without excessive water loss. Moss can absorb and hold water, which is crucial for maintaining a consistent moisture level around the plants it supports. Additionally, it is soft and flexible, making it easy to adapt to various container shapes and sizes.

The other options do not provide the same level of utility for waterproofing. Ferns tend to allow water to pass through rather than containing it effectively. Cacti, while known for their water retention capabilities, do not serve as a waterproof barrier. Succulents, similarly, are also designed to store water rather than assist in waterproofing. Thus, moss stands out as the most effective material for this purpose in basket containers.