Green Planet Plant Guard Green Planet Nutrients Sale! from $10.50 CAD Size 1 L 4 L Qty. Add to Cart Inventory on handShips within 24hours Mon-Fri This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. PLANT GUARD is a potassium silicate supplement, which may increase the rigidity of your plant’s cell walls. SKU: 210000004267 Tweet