Slug nematodes (Phasmarhabditis californica) are microscopic worms that naturally target slugs in the soil. When applied, the nematodes seek out slugs, enter their bodies, and feed from within. Within a few days the slugs stop feeding and die shortly after. Safe for use around pets, children, and wildlife, these nematodes for slugs in UK gardens offer a simple, chemical-free way to protect plants. How Nematodes for Slugs Work in the Soil Slug nematodes occur naturally in soil but in low numbers. By applying additional nematodes, you increase their presence and quickly reduce slug populations. Once inside the slug, the nematodes feed and multiply, spreading to other slugs in the area. This breaks the slug life cycle and helps protect your plants from root and leaf damage. When to Apply Nematodes for Slugs in UK Gardens For best results, apply nematode slug control every six weeks during the growing season when soil is moist and above 5ºC. Starting treatment before planting gives protection as young plants establish. Applications can continue through spring, summer, and autumn to maintain control and reduce future slug problems. Sizes Available for Nematodes for Slugs UK Slug nematodes are available in different pack sizes to suit your garden. Options include packs for 40 square metres and 100 square metres. Why Choose Nematode Slug Control for Your Garden Using nematodes for slugs offers a natural way to protect ornamental plants, fruit, and vegetables. They are safe for wildlife, pollinators, pets, and children while remaining highly targeted against slugs. With repeat use through the season, you can reduce slug populations and enjoy healthier plants. How to Apply Slug Nematodes Around Plants The nematodes come with full instructions and can be applied using a watering can or nematode applicator. Apply to moist soil when the soil temperature is above 5ºC (41ºF) and ensure the soil does not dry out for at least two weeks after application. Nematodes are capable of surviving the odd frost, so don't worry if the temperature falls after application. Please note: these are a live product with an expiry date of around two weeks and are non-returnable. Use the whole pack before the expiry date. Best applied: Feb/March – October. Slug Problems in the Garden: Causes, Damage & Solutions Slug Nematodes FAQs If the answer is not listed below check out more questions about slug nematodes What are slug nematodes? Slug nematodes are microscopic organisms used in soil to control slugs naturally and help reduce damage to plants. How do slug nematodes work? They enter slugs in the soil and stop them feeding, helping reduce slug activity around plants. When is the best time to apply slug nematodes in the UK? Apply in spring or autumn during mild damp conditions when slugs are active. What soil temperature is needed for slug nematodes? Soil temperature should be at least 5°C for slug nematodes to work properly. How do I apply slug nematodes? Mix with water and apply evenly to moist soil using a watering can or sprayer. Do I need to water the soil before and after application? Yes, soil should be moist before application and kept moist for 3 to 4 weeks after treatment. How long do slug nematodes take to work? They usually start working within a few days as slugs stop feeding in treated soil. Are slug nematodes safe for pets and children? Yes, slug nematodes are safe for pets, children, plants, and wildlife when used as directed. Can slug nematodes be used in pots and raised beds? Yes, they are suitable for pots, containers, borders, and raised beds. How much area do slug nematodes cover? Coverage depends on the pack size and the recommended application rate shown on the packaging. How often should I apply slug nematodes? Repeat applications may be needed during active slug periods to maintain control. 10 ways to stop slugs destroying your garden Life cycle of slugs What are slug nematodes