For years gardeners have been adding manure to their garden beds to increase nutrient levels and grow healthier, more productive plants. What you may not know is that the manure also improves the aeration and water retention qualities of the soil. If you're considering using horse manure to fertilize your garden it's important to know just how much horse manure fertilizer to use. With a good dose of horse manure your plants, from vegetables to flowers, will benefit and pay you back in beautiful blooms and a good harvest.
Spread a layer of manure over the entire surface of your garden anywhere from 1 to 3 inches deep. Make the layer as even as possible.
Work around your existing plants and avoid touching them directly with the manure, especially at the trunk or stem. Leave the manure on the surface to act as mulch, or turn it in with the soil with a cultivator being careful to not disrupt any roots.
Treat an empty, unplanted garden by mixing the manure with the soil in the bed. Turn the soil and the manure together multiple times up to 6 to 8 inches deep.
Add more manure again in the late fall over a bare vegetable or annual bed and leave it on the surface over winter. Till the manure under in the spring as soon as the ground is workable.