A popular soil amendment and natural source of potash! 7 . $18.25. Loosens clay soils, binds and catalyzes release of additional nutrients from the soil. If there is an immediate need for available potash, it is suggested that Greensand Plus (a combination of Greensand … Espoma #GS36 36LBLB Greensand … Down To Earth Greensand is composed primarily of glauconite, a blue-green siliceous mineral that is harvested from marine sedimentary … $19.99. … Down to Earth Organic Langbeinite Fertilizer Mix 0-0-22, 5 lb 4.6 out of 5 stars 205. Apply at 1-2 … DTE Greensand is highly recommended for vegetables, fruits, herbs, lawns, ornamentals and all types of trees and shrubs. DTE Greensand … Traditionally used to loosen heavy clay soil or to hold together loose sandy soils, DTE Greensand is able to absorb up to one-third its weight in water to improve the moisture holding capacity of garden soils and potting mixes. 15% potash and contains 30+ trace minerals. NOTE: Greensand is a slow release insoluble source of potash and trace elements. Down to Earth Organic Greensand Fertilizer, 5 lb 4.8 out of 5 stars 128. Improves moisture holding capacity of garden soils and potting mixes. This green colored sand has a fine sandy like formulation.