Using Decorative Stone to Suppress Weeds in Flower Beds

Will a Layer of Stone Stop Weeds?

A gardener with plastic landscape fabric and annual mulch still battles weeds and wonders if adding decorative stone will help. The answer: weeds grow between stones just as they do in mulch. Stone alone is not a reliable weed barrier.

Better Weed‑Control Strategies

• Preen (pre‑emergent herbicide): Prevents weed seeds from germinating. Safe around established perennials, but cannot be used where you plan to sow seeds.
• Corn gluten meal: Organic alternative with similar pre‑emergent action.
• Maintain a thick mulch layer (3‑4 inches): Organic mulch suppresses weeds and improves soil.
• Hand‑weed regularly: Remove weeds before they set seed.

What About Existing Perennials?

Preen will not harm established perennial plants, but it will prevent any new seeds (including desirable self‑sowers) from sprouting. Apply only after all desired plants have emerged.

Key Takeaway

Stone adds aesthetic appeal but does not eliminate weeds. Combine a quality landscape fabric, sufficient mulch, and a pre‑emergent product for the best results.