wood nuggets last longer than wood chips — about seven to 10 years, but many people freshen their mulch with a thin coat in the spring. You should know that they have a lower pH than chips, so they’re good for acidic-
Besides the sol–gel synthetic method [106,107], a better eco-friendly approach is represented by the use of natural or waste materials, such as coffee biowastes, as sustainable flame retardants. In particular, spent coffee grounds were chemically modified with phosphorus (dimethyl phosphite) in ...