The only type of product that will stop plants from being able to grow for a year in your pea gravel would be a soil sterilant. Bonide Total Vegetation Killer is a non-selective herbicide/mild soil sterilant and it will kill almost all plants down to the roots and it prevents new plant growth for up…
Read Full Answer »
Bonide Total Vegetation Killer is not labeled for use around bodies of water so we cannot recommend it for this use. You may want to consider using a product that is specifically labeled for use as an aqautic herbicide for safest results.