I seem to've acquired some gravel that was loaded with moss spores. All is in full sun and in large raised beds so water & shade are not the problem. Some threaten to grow over the semps. Can I use ferrous sulphate ott (over the top) of the semps to control the moss? If not, what CAN I do to get rid of the moss. Hand-picking is out of the question (too much square footage). Thanks for any help.
