Greenhouse under siege: How a simple walnut shell can turn the tideThe presence of ants near a greenhouse often signals an imminent aphid infestation, as ants actively protect these pests to feed on their honeydew. Photo: Pravda.ru by Elena Moroz, https://creativecommons.org/public-domain/pdm/ Ants in the gardenOne practical method for controlling ant populations involves creating localized bait stations using walnut shells. Building Walnut Shell Bait Stations Creating small, targeted insecticide delivery points to ensure poison reaches the ant colony's core. Prepare the shells Use whole walnut shell halves. Placing poison baits directly among fruits or greens intended for consumption is prohibited for safety reasons.