Companion Plant Guide
Tomato
Masks tomato scent from pests. Keep it pinched.
Herb · Mint family
Basil companion plants
Ocimum basilicum
What to plant beside basil, what to keep apart, and how to grow it — sun, spacing, soil and the pairings used in this guide.
Photo: Tobias Doering on Unsplash
Overview
Growing basil beside the right neighbour
Basil (Ocimum basilicum) is a herb in the Mint family. Fragrant herb perfect for cooking and pest control.
Keep basil pinched — flowering drops the aromatic oils that do the pest work.
Give plants 6–12 in in full sun. Aim for well-draining, fertile soil with regular moisture. In most gardens the crop sits in USDA zones 2-11 (annual) and is ready in about 20-30 days.
Grows well with
What to plant with basil
The strongest companions for basil in this guide are Tomato, Pepper, Carrot, and Cucumber. Each pairing below is a reason to share a bed — pest masking, roots that do not compete, or insects that hunt the pests basil attracts.
Pepper
Pest deterrent and beneficial space sharing.
Carrot
No nutrient competition. Complementary growth.
Cucumber
Attracts pollinators and beneficial insects.
Keep apart
What not to plant with basil
Keep basil away from Fennel and Rue. These neighbours compete for the same food, release chemicals that stunt growth, or otherwise hold the crop back.
Fennel
Inhibits basil growth and germination.
Rue
Allelopathic - interferes with basil growth.
In the bed
How to grow basil
| Sun | Full sun |
|---|---|
| Spacing | 6–12 in |
| Soil | Well-draining, fertile soil with regular moisture |
| Hardiness | Zones 2-11 (annual) |
| Days to maturity | 20-30 |
These notes sit beside the companion lists — they are how basil actually occupies the bed, not a substitute for local climate.
- Pinch off flower buds to encourage leaf growth
- Harvest leaves regularly to promote bushiness
- Plant after all frost danger has passed
- Use fresh or dry for storage
Questions
Basil companion planting FAQ
What can I plant next to basil?
Plant Tomato, Pepper, Carrot, and Cucumber beside basil. Tomato: Masks tomato scent from pests. Keep it pinched. Pepper: Pest deterrent and beneficial space sharing. Carrot: No nutrient competition. Complementary growth. Cucumber: Attracts pollinators and beneficial insects.
What should I not plant with basil?
Keep basil apart from Fennel and Rue. Fennel: Inhibits basil growth and germination. Rue: Allelopathic - interferes with basil growth.
How much sun does basil need?
Basil wants full sun. Space plants 6–12 in apart in well-draining, fertile soil with regular moisture.
How long does basil take to mature?
Most basil crops in this guide mature in 20-30 days, in hardiness zones 2-11 (annual).
Compare every pairing at a glance
Open the guide, pick basil, and see what thrives alongside it — and what quietly holds it back.
Open the pairing guide