Biological Pest Control: Nematodes As A Chemical-Free Option

Application is simple but does depend on getting the conditions right. Nematodes are typically mixed with water and applied with a watering can or hose-end feeder directly onto moist soil, since they need moisture to move through it and reach their target. Soil temperature also matters: most products need the soil to be above a minimum threshold, often around 5°C, to remain effective.

Food choice should shift with the seasons. High-fat foods such as fat balls and suet blocks suit the colder months, when birds need extra energy to maintain body heat. During the breeding season, softer foods and mealworms are more useful, since adult birds feed these to chicks that cannot yet manage tougher foods. Sunflower hearts work well year round and avoid the mess of husks left by whole sunflower seeds.

Nematodes are microscopic roundworms that occur naturally in soil, and certain species have been developed for use against specific garden pests. Rather than acting as a broad chemical treatment, each nematode species is matched to a particular biological pest control, seeking it out and interrupting its lifecycle with far less impact on the rest of the garden than a chemical spray.

Shelter matters as much as food. A quiet, shaded corner away from foot traffic and pets, ideally backed onto a hedge or shrub border, is the right spot for a dedicated shelter. Gardeners setting one up for the first time often start by browsing hedgehog houses to see the range of designs suited to different garden sizes.

Easy access matters most. A shallow, gently sloping edge lets amphibians move in and out of the water without difficulty, while steep, hard-edged ponds can be surprisingly difficult for them to use. Nearby damp, shady spots, a log pile or a compost heap close to the pond, give them somewhere to shelter and hibernate once they leave the water for the colder months.

Plant choice shapes how much a garden offers wildlife across the year, and it is about more than flowers alone. Shape, structure, timing and what a plant offers after flowering, whether berries, seed heads or dense cover, all matter as much as bloom colour.