What is the best soil for a wicking bed?
Ava Arnold
Updated on February 19, 2026
To act as a wick, the soil needs a high proportion of organic matter; a 50/50 blend of organic soil and compost works well.
What do you put in the bottom of a wicking bed?
Wicking beds water plants from below rather than above. It's basically a container with a water reservoir at its base. Moisture is drawn up through the soil via a process called capillary action or wicking.How deep should the soil be in a wicking bed?
The optimum depth of soil in a wicking bed is around 40cm, as it provides sufficient soil depth for growing vegetables, while allowing newly-planted seedlings easy access to water. Using a soil depth of 40cm, with the standard water reservoir height of 20cm requires a raised bed height of 60cm.Can you use sand in a wicking bed?
While the volume of river sand used in wicking beds is insignificant compared to that used in the construction industry, it still contributes to the problem.How deep should the gravel be in a wicking bed?
Note that the gravel filled reservoir should not be more than ¼ the height of the bed (e.g. 10cm in a 40cm deep bed). For wicking to occur through the gravel, make sure the gravel pieces are less than 10 mm in size.Making wicking soil
What material is best for wicking water?
Cotton is a commonly recommended wicking material, but some warn that natural materials, like cotton, may rot or contract fungus easily. Wicking materials less likely to encounter this problem include nylon and acrylic.How do you make wicking soil?
To act as a wick, the soil needs a high proportion of organic matter; a 50/50 blend of organic soil and compost works well. Fill the water reservoir via the vertical inlet pipe until water drains form the overflow outlet. Secure a piece of fly-mesh or a cap on both to prevent mosquitoes breeding in the reservoir.What are the disadvantages of a wicking bed?
Cons
- Trickier to install. Wicking beds require some technical understanding and skill to be built properly; they can leak, or over-saturate the soil, either due to poor design or being installed incorrectly. ...
- More expensive. ...
- More materials. ...
- You can break them (if you try hard enough). ...
- Some training required.