Age Old Kelp .3-.25-.15 Liquid Kelp is the original soil plant biostimulant. When applied as a soil drench, Age Old Kelp liquid concentrate helps build soil tilth, and will restore the biological life of damaged soils. When used as a foilar spray, Age Old Kelp provides needed micronutrients, while improving the uptake of most nutrients. Liquid Kelp concentrate supplies your plants with fast-acting and an odorless sources of minerals.