How it works
Water
Soil fills to what it can hold; the rest drains to the drainage layer.
- Layers go in damp, at about three quarters of what they hold.
- Gravel, LECA or lava rock under the soil catches excess water below the roots.
- Water wicks up from a wet drainage layer, and sideways into drier soil.
- When water rises into the root zone, roots start to rot.
- An as-needed watering tops the soil back up to 92% and no further.
Stats
- Wilting point
- 30% of capacity
- Root zone
- 3.5 cm
- Wicking up peat or coir
- 4.5 cm
- Sideways spread
- 20% of the gap a day