Margo Garden Products Gravel collection selects only high quality all-natural stone from regions around the globe. Use Rainforest 30lbs. Cream gravel to control water erosion, decoration around trees and flower beds, topcoat material for a ballast roof system, and/or reduce water usage with a dryscape lawn and garden. Rainforest natural stone gravel helps stimulate a healthy natural environment for fish in aquariums, ponds, and reduces the amount of unhealthy debris in the water.