But quicker benefits are had when alfalfa is brewed into a tea. The primary boost comes from the millions of microbes in the fermented meal that activate the soil organisms that then convert nutrients into forms available to plants. Roses love it. Only apply alfalfa to the surface. If placed in the root zone, the rapid decomposition of alfalfa will generate heat which can damage the roots.
Blood meal is completely soluble and can be mixed with water and used as a liquid fertilizer.
Meal fertilizers, when not brewed, work best when they are scattered on top of the bed and watered in. All meals are used up fast. Bacterial action works quickly. The extremely slow availability of nutrients from bone meal make it a very safe fertilizer, especially when planting of potting very young or new plants. Compost, worked into new beds or top dressed and watered into established beds, increases microorganism activity and improves soil character and moisture retention.