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 pest, seeking it out and interrupting its lifecycle with far less impact on the rest of the garden than a chemical spray.
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: https://wiki.internzone.net/index.php?title=9_Legal_Guidelines_Of_Slug_Nematodes most products need the soil to be above a minimum threshold, often around 5°C, to remain effective.
Hedgehogs typically hibernate through the coldest months, often in piles of leaves, log stacks, or purpose-built shelters tucked into a quiet corner. Anything resembling a bonfire pile should always be checked carefully before lighting, since it can look like an ideal hibernation spot to a hedgehog settling in for winter.
Flower choice makes a real difference. Single-flowered varieties expose their pollen and nectar openly, whereas heavily double-petalled blooms often hide or lack it altogether. Planting in drifts rather than single specimens also helps, since it gives foraging insects a more efficient source to work through.
Placement decides whether the house gets used at all. A fixed position at around waist to head height, facing south or south-east to catch the morning sun, and sheltered from driving rain and strong wind, gives insects the stable conditions they need. Once occupied, the house is best left undisturbed through the nesting and overwintering period.
Fresh water for drinking and bathing rounds out a decent set-up. Gardeners building out their feeding station for the first time typically start with a good spread of bird feeders to cover the different food types birds look for.