There is no need to let the yellow mellow when you use your urine in your garden. This excellent post looks at the composition of urine, safety issues and encourages you to get over the grossness issues, which really only reside in your mind. Once you’re past this, you’ve got a never-ending supply of a garden supplement that is “high in nitrogen, moderate in phosphorus and low in potassium and can act as an excellent high-nitrogen liquid fertilizer or as a compost accelerator.”
Note their recommendation to dilute pee at least 1 part urine to 10 parts water.
Read the article “How to use pee in your garden” on the Northwest Edible Life website.