How Are Plants With Hanging Roots Able to Absorb Water?

The roots of plants serve several purposes, only one of which is the absorption of water. While the hanging roots of many plants are capable of absorbing water from the air, that may not be their primary purpose.

Root Functions

Surface roots

Roots, including hanging roots, have functions beyond the absorption of water and nutrients. They also serve to anchor plants, to help with the exchange of gases, and to store food.

Functions of Aerial Roots

Ivy covered walls

Not all aerial roots are hanging roots. Some are small filaments whose purpose is to anchor plants to a support such as a tree or wall. Ivy, for example, has a system of aerial roots that allow it to climb.

Backup Systems

Dewy leaves

Plants do not depend entirely on roots for the absorption of water. Leaves are also able to absorb and to release water through pores.

Anchoring Plants

The main function of some hanging roots is to reach the ground and anchor the plant to protect it from wind damage. These are called prop roots or buttress roots.

Respiration

Some plants which grow under water send up stems which develop hanging roots to help with plant respiration. Roots that help with plant respiration can also grow upwards from the principal root system.

References

• "UCLA Botanical Garden: Types of Roots"
• "Royal Botanic Gardens, Kew: Epiphytes"