Can I mix horse manure and grass cuttings to use as a mulch

Question

I live in Spain and would like to mix horse manure and grass cuttings to use as a mulch on flower beds and roses.

Answer 1

Animal manures need to be composted, at the very least allowed to dry for a year, before they can be used on your plants. This article will tell you more about using horse manure: https://www.gardeningknowhow.com/composting/manures/horse-manure-compost.htm