Emerald Harvest Root Wizard 1L — PGPR Root BoosterEmerald Harvest Root Wizard 1L Plant Growth Promoting Rhizobacteria The 1 litre size of Emerald Harvest's flagship root zone booster packed with multiple strains of plant growth promoting rhizobacteria (PGPRs) that colonise the root zone, dramatically increase root mass, and enable plants to absorb significantly more of whatever nutrients you're feeding. Designed primarily for hydroponic systems where active biological root zone support makes the