3. Manure

Animal manure is one of the oldest fertilizers in the world. Even with the invention of artificial fertilizers, though, old-fashioned manure remains one of the most effective ways to add a wide range of nutrients to the soil.

Chicken manure is one most popular manures for fertilizing gardens, thanks mostly to the fact that it is easier to collect in large amounts. However, you can also use horse manure, cow manure, goat manure, or manure from most any other livestock animal.

One important word of caution when using manure to fertilize a garden, though, is that using too much manure or using manure that is too fresh can “burn” your plants. Therefore, it’s important to use the right amount of manure in your garden as well as let your manure age and dry out some before you apply it.