What is a wicking watering system?

A wicking system is a clever way to water plants from below rather than from above. Instead of pouring water onto the surface, a reservoir of water sits underneath the growing medium. The premium potting mix draws water up slowly through capillary action, keeping moisture consistent without ever letting the roots sit in a puddle.

Think of it like a sponge sitting in a shallow dish of water. The sponge slowly absorbs what it needs, rather than getting drenched all at once from the top.

Why is this useful?

1. More consistent moisture. Plants draw water as they need it, rather than going through wet and dry extremes between waterings.
2. Less watering needed. The reservoir can hold enough water to last several days, which is useful in hot Queensland summers or if you are away from home.
3. Fewer fungal problems. Watering from below keeps the foliage dry, which reduces the conditions that cause mildew and disease.
4. Efficient water use. Very little water is lost to evaporation because it is stored below the surface rather than sitting on top.

How do you set one up?

1. Create a sealed water reservoir at the base of your container, separate from the growing medium above it.
2. Use a pipe or fill tube to top up the reservoir without disturbing the roots.
3. Include an overflow hole so the reservoir does not overfill.
4. Fill the growing area with a quality premium potting mix, which will draw the water up steadily.

Does this apply to Corrogarden raised beds? Our beds use a recycled plastic tub liner with breather holes, which allows water to drain freely and lets air reach the roots. This prevents waterlogging and creates healthy growing conditions rather than a sealed wicking system. That said, watering deeply and less often mimics many of the same benefits. See our filling guide for more on setting up your bed correctly.

What should I plant right now? Our free planting calendar shows what suits your postcode this month. Ready to grow? Browse our raised garden beds or build your own with the garden bed builder.

Image: public domain, via Wikimedia Commons.