40mm Riverstone
40mm stone has very similar features to the 20mm stone in features and applications it works both as an effective drainage stone and a landscaping stone. The main difference between the two stones is that because the 40mm is a mix of sizes it does make for a more uneven surface for walking on or driveways, it is also slightly harder to handle and spread in comparison to the 20mm stone.
Features
Permanent
Weed Control
Small Size
Provides humus and is a valuable food source
Benefits
Only need to put down once versus bark
You can spray directly onto stones
Easier to handle and spread