Brassicas (cabbage, broccoli, cauliflower, kale) are heavy feeders and face severe pest pressure (cabbage moths, flea beetles, white butterflies). Strategic companions reduce chemical spray requirements by 50–70% while adding income through intercropping.
Why Brassicas Need Companions
- Pest pressure: Cabbage white butterfly lays eggs on brassica leaves; larvae (caterpillars) cause 20–40% crop damage
- Flea beetle damage: Especially on young seedlings; 30–50% leaf damage possible
- Nitrogen demand: Heavy feeders; companions like legumes or alliums improve nutrient availability
- Pollinator need: Broccoli/cauliflower rely on bee pollination for seed production
Top Brassica Companions
1. Cabbage + Dill (Parasitoid Attraction)
Planting distance: 25 cm from cabbage; 1 dill per 3 m² cabbage When to plant: Dill 4–6 weeks before peak cabbage white butterfly pressure (mid-spring)
Dill flowers attract tiny parasitoid wasps that lay eggs in cabbage white butterfly larvae, killing them naturally.
Result: 40–60% reduction in cabbage damage; eliminates 1–2 insecticide sprays (2,000–4,000 PKR savings/hectare).
2. Cabbage + Nasturtium (Trap Crop)
Planting distance: 20 cm; 1 per 2 m² cabbage When to plant: After last frost
Cabbage whites prefer nasturtium to cabbage. Plant 1–2 nasturtiums per 2 m² cabbage as sacrificial trap. Daily inspection and crushing of insects reduces overall pest population.
3. Broccoli + Borage (Pollinator Magnet)
Planting distance: 60 cm from broccoli; 1 plant per 50 m² When to plant: After last frost (self-seeding)
Borage flowers attract honeybees. Broccoli seed production improves 20–30% with enhanced pollination.
Farmer benefit: For seed growers, borage is essential. On a 0.5-hectare broccoli seed plot, pollination improvement = 10–20% yield increase (5,000–10,000 PKR additional revenue).
4. Cabbage + Thyme (Pest Suppression)
Planting distance: 30 cm from cabbage border When to plant: Spring (perennial; lasts 5+ years)
Thyme's volatile oils repel cabbage moths and flea beetles by 30–50%. Thyme is also harvestable (edible/medicinal, 150–300 PKR/kg dried).
5. Brassica + Alliums (Flea Beetle Suppression)
Planting distance: 20 cm from cabbage; 15 cm between onions/garlic When to plant: Onion 4–6 weeks before brassica
Allicin/diallyl disulfide reduce flea beetle populations by 40–60%. Garlic's antifungal properties reduce brassica diseases (bacterial spot, downy mildew).
6. Cabbage + Marigold (Nematode & General Pest Control)
Planting distance: 40 cm; border or interspersed When to plant: After last frost
Marigold roots suppress root-knot nematodes (occasional brassica pest). Sulfur compounds repel whiteflies.
7. Cabbage + Herbs (Basil, Cilantro, Parsley)
Planting distance: 25 cm from cabbage When to plant: 2–3 weeks after brassica transplant
Herb volatile oils deter cabbage moths and flea beetles. Cilantro/parsley flowers attract pollinators. Basil is a secondary cash crop (200–400 PKR/kg).
8. Brassica + Beans (Nitrogen Fixation)
Planting distance: 60 cm from cabbage; beans on trellis parallel When to plant: Same time or beans 2 weeks later
Beans fix 40–80 kg N/hectare, reducing brassica fertilizer need by 30–50% (3,000–6,000 PKR savings). Sequential harvests: beans 60–70 days, cabbage 70–90 days.
Brassica Intercrop Model (1-Hectare Farm)
| Crop | Area | Population | Yield | Revenue |
|---|---|---|---|---|
| Cabbage | 0.50 ha | 22,000 | 20–25 t | 400–500k |
| Onion | 0.20 ha | 22,000 | 200–300 t | 200–300k |
| Beans | 0.15 ha | 5,000 | 0.75–1 t | 112–200k |
| Dill/herbs | 0.10 ha | 1,500 | 0.3–0.5 t | 60–150k |
| Marigold | 0.05 ha | Border | — | Pest control |
| Total | 1.0 ha | — | — | ~772–1.15M |
FAQ
Does companion planting replace insecticide sprays? No, but reduces them significantly. Start with 3–4 sprays/season (monoculture); companions reduce to 1–2 sprays (organic/conventional farms save 2,000–4,000 PKR/hectare).
When is peak cabbage white butterfly pressure? Spring (Feb–Apr in South Asia) and fall (Aug–Oct). Plant dill 4–6 weeks before each peak period.
Can I grow all companions on a small cabbage patch? Yes. Prioritize: Dill (parasitoid attraction), Nasturtium (trap crop), Onion (flea beetle control). That's 80% benefit.
Farmer: Is intercropping more labor-intensive than monoculture? Yes, +15–20% labor. But reduced pesticide sprays balance that cost. Net profit margin improves due to dual revenue streams.
Related Guides
Plan brassica companions for your region on our crop calendar.
Frequently Asked Questions
Does companion planting replace insecticide sprays? +
No, but reduces them significantly. Start with 3–4 sprays/season (monoculture); companions reduce to 1–2 sprays (organic/conventional farms save 2,000–4,000 PKR/hectare).
When is peak cabbage white butterfly pressure? +
Spring (Feb–Apr in South Asia) and fall (Aug–Oct). Plant dill 4–6 weeks before each peak period.
Can I grow all companions on a small cabbage patch? +
Yes. Prioritize: Dill (parasitoid attraction), Nasturtium (trap crop), Onion (flea beetle control). That's 80% benefit.
Farmer: Is intercropping more labor-intensive than monoculture? +
Yes, +15–20% labor. But reduced pesticide sprays balance that cost. Net profit margin improves due to dual revenue streams. ---