This question comes from a facebook fan. Thanks for the Question Sylvia! The Answer to your question is…….. it depends
Horse manure can be a good amendment to your organic garden as long as you take a few things into consideration.
The first, is it seasoned? Horse (and cow, chicken, rabbit, etc.) manure will burn your plants if its fresh, so make sure it has finished “cooking” (at least 6 months old) before you add it to your garden.
B.) You will want to find out what they are feeding the horses. Unfortunately, many of the feed we give livestock today is plain and simple poison. More and more crops are genetically modified (GMO alfalfa has shown to cause kidney and liver failure, yet was still approved.) and other crops are sprayed with pesticides that stay on the plants that the horse eats. Some of it makes the journey out the other end of the horse, and if your put it in your garden, ends up on your dinner plate.
3rd.) Anti-biotics! Anti-biotics will pass out of the animal as well, and just as before if you add it to your garden…..
Of course, it’s up to you what you add to your garden. I for one stick to worm castings. Worms break their food down at a molecular level leaving clean organic deliciousness for your plants, that won’t burn them (our you in the long run). You can also ( I do ) use broad leaf plants as a living mulch to fertilize your garden.