Ground up redwood, which is a byproduct of the lumber mills, has been stabilized with nitrogen instead of composted. The Fine Redwood Amendment has a a rounded particle size, good for incorporating into clay soil. It helps aerate the soil making it easier for water to penetrate into the soil. Over time the bacteria and the fungi in the soil will break the redwood amendment down.

Light weight horticultural gravel used as an amendment to aerate soil mixes