Soil Amendments: Compost High in microbial activity, retains moisture, enriches soil properties, reduces watering and helps break up clay – an excellent alternative to peat moss. Leaf and grass based. Black Peat Loam A soil amendment for preparing a well balanced growing mix. Optimizes plant growth through root development. Composted Pine Mulch Fines A dark black extra fine natural material rich in micro-nutrients used by top growers to stimulate growth.