Oldtimer Organic GranulesGranules potting up mix increases root growth, improves stress tolerance and forms a barrier against root disease. Add a tablespoon of this to your pots at the start of your grow and see the benefits. It's made up of Mycorrhiza, bio stimulants and over 20 strains of microorganisms, adding 20g (approximately a tablespoon) of this mix to 10 litres of soil creates a rich beneficial micro life within the soil to improve root growth, disease resistance and