Grow More® Mendocino Avalanche flower hardener is specially developed and field tested in the Emerald Triangle of Humboldt, Mendocino and Trinity Counties in Northern California. Avalanche's special form of soluble ortho phosphate helps promote flower development in the final bloom stage for an increase in the size and mass of flowers. Properly timed phosphate applications helps support flower development. Fortified with Norwegian kelp extract, which supplies organic carbon, amino acids and carbohydrates.