Topsoil is generally available to buy in three different grades:
PREMIUM GRADE:
No weeds or seeds, high in fertility, this loamy soil has good structure and is commonly used to build up flower borders or create new beds or amending poor soil when placing sod.
(60 % sand - 10 % clay - 25 % silt - 5% organic matter)
GENERAL-PURPOSE GRADE:
No weeds or seeds. Good for making new beds or borders, or as a base for sowing new lawns. Coarser grades are particularly useful for turf laying while finer grades are good for top dressing lawns.
(60 % sand - 10 % clay - 25 % silt - 1% Organic matter)
ECONOMY GRADE:
No weeds or seeds. This has a slightly higher clay content but is screened. It is used as an economy filler or base for sod where volume rather than quality is required.
(35 % sand - 45 % clay - 15 % silt - 1% organic matter)