Plagron Growmix 25 LPlagron Growmix is a premium blend of selected peat soils, enriched with perlite and worm castings, that combines immediate yields, professional structure, and balanced nutrition for the first few weeks of growing. It offers the ideal environment for explosive plant development from transplant. Thanks to its 3 week pre fertilization, Growmix progressively releases the nutrients needed for the initial growth phase, allowing your plants to root quickly,