Posted: Today at 06:55
Some things like mediterranean plants (lavender etc) love a sandy soil. Builders sand in general will not harm your plants. Where I come from (Mansfield) they quarry the stuff out by the lorry load, and many gardens are based on the same sandy soil. Plants seem to grow OK. If there is a lot of lime, you will not be able to grow acid lovers like Rhododendrons. Test the soil to see what pH it is. (test kits at garden centres) A foot ( 30cm ) of top soil is fine for most perennials, shrubs will get their roots down in to the subsoil. If the soil is very sandy, add a load of water holding humus like well rotted farm yard manure or composted fine bark, or your own compost if you make it from your kitchen waste , peelings etc.