Landscaping rock creates a low-maintenance ground cover that stays put, unlike lightweight mulch, which can blow away. The rock helps smother unwanted plant growth, but some stubborn weeds find a way to thrive.

How many inches of rock do I need to prevent weeds?

Like organic mulch, a 2-3” layer of stone is required to prevent weeds. Stone eventually works its way into landscape soil and is very difficult to remove when a landscape remodel is in order. Dust and dirt also settle between rocks that ultimately allow weed seeds to germinate.

Will weeds grow through stones?

Decorative Stones (Aggregate).

You need a decent layer (3 to 5 inches) but not too deep as this can lead to puddle and weed growth. For the small amount of weed that may appear from then on you'll find they're small and with a tiny bit of elbow grease can easily be pulled.