Derived from a Quarry in Yorkshire, UK. It is a good source of potassium, magnesium, calcium and sulphur. Water soluble. Extra fine.
Directions for use:
Soil Mix 1.25 – 2.5ml per litre of soil.
Top Dressing 0.5 - 2 ml per litre.
Outdoor 25 – 50g per metre squared. Every 6 – 12 weeks during growing season.