Vermiculite is a pH neutral natural material made of mica which has an enormous surface area due to its laminated structure. This means that Vermiculite is capable of holding several times its own weight in water. When used in compost it promotes good drainage at the same time as holding moisture and nutrients close to the plant roots which results in better seed germination and stronger growth.
It can also be used as an alternative to sieved compost to cover seeds after sowing. It helps minimise the growth of moss or green algae on the compost surface as well as providing lightweight support to seedlings as they emerge.
Benefits
- Eases re-wetting of growing media when it has dried out.
- Extends watering intervals.
- Improves growing media aeration.
- Acts as a nutrient buffer.
- The excellent insulation properties and ability to hold nutrients as well as air make it an ideal choice for seed composts.