How to Grow Pepper

Basil releases linalool and methyl eugenol volatiles that repel aphids and thrips from neighbouring pepper plants. Its dense foliage also shades the soil around pepper stems, reducing moisture evaporation in the critical fruit-set period.

Carrots' deep taproots occupy a different soil layer than pepper's shallow fibrous root system, eliminating competition for water and nutrients. Carrot foliage also provides a low windbreak that reduces pepper stem stress.

Onions exude sulphur compounds through their roots that repel aphids approaching from soil level, providing ground-up protection for pepper plants. Their compact growth habit also fills gaps without shading pepper canopies.

Peppers and tomatoes share the same Solanaceae family requirements for warmth, calcium, and consistent moisture, making them efficient bed companions. Their similar canopy heights also create a uniform microclimate that benefits both during fruit ripening.

Garlic's sulphurous root exudates create a repellent zone around pepper stems that deters aphids and spider mites. Plant garlic cloves in autumn between pepper positions for established protection by spring transplant time.

Oregano releases carvacrol and thymol — potent terpenoids that repel aphids, whitefly, and spider mites from nearby pepper plants. Its low, spreading habit also serves as a living mulch that suppresses weeds around pepper stems.

Peppers and potatoes are both Solanaceae and share late blight (Phytophthora infestans) and bacterial wilt (Ralstonia). Growing them together amplifies disease pressure and complicates crop rotation. Separate by at least 3 metres.

Fennel roots exude allelopathic compounds — particularly trans-anethole — that inhibit pepper root development and reduce fruit set. Fennel should be isolated from all garden vegetables, planted at least 2 metres away.