What are clay irrigation capsules?Reader submitted

Clay irrigation capsules are low-fired, ceramic containers that remain water-permeable after firing. Plants are located adjacent to each capsule and root systems adhere to the ceramic wall and draw water as required. Capsules do not require batteries, connection to water mains, electronic timers or flow meters – only gravity is required for them to work. A water barrel is connected to a series of capsules using standard irrigation t-joints and 4mm poly tube. The water barrel should be situated a few feet higher than the level of the garden.

Water release from a capsule is entirely self-regulating and one of the most efficient methods of watering. If the soil becomes saturated due to rain, the water pressure acting on the inside and outside of the ceramic wall equalises and water flow will cease. As the surrounding soil dries, the water pressure on the inside of the capsule pushing outwards increases and the water will begin to seep again – in constant proportion to the drying of the surrounding soil. Surface evaporation is eliminated as wateris delivered only to the plant root system and, for the same reason, weed growth is discouraged.

Installing capsules is as easy as a standard irrigation system. Capsules are ideal for balcony gardens, roof-top gardens, in-ground gardens, raised gardens, barrel planters and glasshouses. With these capsules installed you could go on holiday for a week (or longer, depending on the capacity of your reservoir barrel) and be assured your plants will remain watered in your absence. Liquid fertilisers can be added directly to the water reservoir, reducing the requirement for topical fertilisers and soil conditioners.