Amend, amend, and amend. It is the mantra we all chant when managing our Colorado soils. We here at CSU are constantly recommending that you add organic materials to your soils to improve water and nutrient holding capacity if you garden in sandy, gravelly or decomposed granite soils and to improve soil structure, drainage and filtration of water and nutrients in clay soils. Improving the soil is still important for good plant growth and production of fruit and flowers.
But can you have too much of a good thing? Much is being made, and justifiably so, of phosphates these days and their adverse effect on our groundwater supplies. As a result many states are adopting laws to prevent the addition of phosphates to many products for household and outdoor use.