Greensand is a powdered form of rock called "Glauconite", a natural micaceous deposit formed over 500 million years on the sea bed. Imagine kelp, seaweed, algae and ancient marine creatures, decomposing and becoming mineralised under pressure. It has a characteristic green colour, a powder consistency and mixes well with other organic amendments. Greensand has been popular for hundreds of years as a soil amendment in the USA and is traditionally very hard to obtain in Europe. The reason for its popularity is its soil conditioning ability, Its water holding capacity (10x its own weight!) and nutritional content of 70+ trace minerals and micronutrients (see chart). A healthy soil is vital for a healthy garden, but for many years modern farming methods and irresponsible fertiliser use have resulted in reducing soil content of minerals and nutrition by up to 80%. Making our food less nutritious. Trace minerals importance is bigger than their small amounts implies performing catalytic functions to trigger multiple reactions. Zinc for instance has roles in drought protection and Auxin production which regulates leaf size, and hence a larger role in photosynthesis. Silica has a role in disease protection, plant strength and resistance to pathogens. Boron works synergistically with Calcium, and so on. Studies demonstrate that trace minerals enable plants to efficiently transport nutrients all the way through the plant. So plants are healthier and grow better, significantly strengthening the plant's immune responses. It also improves flavor profiles and nutritional value of fruits and vegetables. Usually only Greensand's potash, potassium, and iron content is noted, but the trace elements are the crucial aspect of Greensand. This is the perfect amendment for supplementing the soil with a wide array of nutrients. One of very few products touted for restoring mineral content to the soil that actually has a verified list of the elements it contains. As such it is the only one we use for producing our own potting mixes and rejuvenating tired soils.
Greensand iron content averages around 15% and potassium levels around 4%, the potassium content will not burn your plants. Silica content can be as much as 55% and although not immediately available it is believed that plants benefit greatly from its presence in the soil.
Greensand is a great soil conditioner, loosening hard soils, and bind sandy soils and assists in the release of other nutrients. Wtaer rention will also increase as a result of its addition. The trace elements can increase levels of particular bacteria that slowly dissolve insoluble mineral nutrients, making them available. Greensand pH varies from slightly acidic to slightly alkaline, having little effect on soil pH balance.
50g/40 litres of compost