What companion plants deter mint pests?
Written by
Benjamin Miller
Reviewed by
Prof. Charles Hartman, Ph.D.Planting complementary crops can strengthen the defenses of mint against pests, using no pesticides. After I interplanted marigolds and peppermint in my garden, my plant aphid infestation died back to a negligible number. Additional pairs also established their micro-ecosystems of beneficial insects. The key is to focus on planting species either recognized to repel or deter insect pests or those that draw insect predators into the ecosystem to help keep it balanced.
Repellent Plants
- Marigolds: Emit limonene to deter aphids
- Chives: Release sulfur compounds against beetles
- Garlic: Produces alyssum to block spider mites
Sacrificial Plants
- Nasturtiums: Trap whiteflies away from mint
- Radishes: Lure flea beetles from leaves
- Chervil: Distract slugs from tender shoots
Plant spacing is an important consideration for companion success. The recommended spacing to achieve the best pest control benefits with marigolds is 8-12 inches from the mint stem. Planting garlic in association requires spacing about 6 inches apart so that they do not compete for root depth and nutrients. My triangular planting method enhanced the activity of the predator insects and introduced beneficial pollinators into the garden, with a 70% increase in activity versus planting in rows.
Soil Preparation
- Mix compost with 10% worm castings
- Maintain pH 6.5-7.0 for most pairs
- Use mycorrhizal inoculant for root synergy
Seasonal Rotation
- Rotate sacrificial plants quarterly
- Replace marigolds every 90 days
- Refresh garlic every fall and spring
Water management improves companion effects. Drip irrigating mint separately from thirsty companions, such as nasturtiums. The way I accomplish this is through split tubing with pressure-compensating adjustable emitters. Providing the mint half of the water volume as the neighboring plants. This keeps moisture zones for trapping pests while reducing fungal issues.
Read the full article: How to Grow Mint: Expert Tips for Thriving Plants
