Fresh mushroom compost contains soluble concentrated salts that can damage seeds, young plants and salt-sensitive plants. It should be bought in the fall and left uncovered over the winter to age or cure. You can also mix fresh mushroom compost with soil before spreading it around your plants.
About the Author
Melody Lee holds a degree in landscape design, is a Florida Master Gardener, and has more than 30 years of gardening experience. She currently works as a writer and copy editor. Her previous jobs include reporter, photographer and editor for a weekly newspaper.