When dug in widely and deeply enough, it will condition the least hospitable clay soils and help them bind nutrients to deliver them to the plants. Pesticides Here are some specific products to consider. Always follow label instructions for these materials. This completely natural, benign substance is made of iron phosphate, a fertilizer ingredient that can help plants grow while controlling slugs. Spread it around the base of plants that you know will sustain major slug damage.
Slugs eat it, stop feeding and die, even if they ingest a very small amount.
Oil-Away Insecticidal Spray. This is based on an agent that coats and kills eggs and suffocates insects. Use when there is an identified insect problem. The powdery granules, a byproduct of corn syrup production, control many germinating weed seeds by keeping young weed seedlings from forming feeder roots. No danger of burning the lawn.