When to plant Broad Bean in Tropical Australia
Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.
Broad beans are sown direct from March to May in the tropical zone — a short window aimed at getting flowering into the coolest dry-season months. Push seed deep, 40–50 mm, spaced 15–25 cm apart in rows 60–80 cm apart; germination takes 10–20 days and pods arrive anywhere from 90 to 150 days later, so a March sowing around Darwin or Cairns is picking from mid-winter. This is a cool-climate legume grown at its tropical limit: lush leaf comes easily, but pods only set when nights cool down, which is why early sowings inside the window consistently beat late ones.
Sowing calendar — tropical zone
Green months are your sowing window: March to May.
Growing notes
Never attempt broad beans in the wet season — seed rots in saturated soil and rust wipes out the foliage. The whole strategy is to sow at the start of the dry so the plants flower through June and July, when nights in Darwin and Townsville are at their coolest. Even then, pod set is the make-or-break issue: plants flowering in warm weather drop blossom after blossom without producing a single pod. The fix is timing, not feeding — sow in March rather than May next season, and pinch out the growing tips once the first flowers open to push energy into pods.
Soil-wise they are undemanding: free-draining ground, no fresh manure or added nitrogen (they fix their own, and extra nitrogen means all leaf and no bean), plus a dusting of lime if your soil runs acid. The 40–50 mm sowing depth matters — shallow seed dries out or gets dug up by birds. Water at ground level once a week and stop overhead watering entirely once flowering starts, because damp foliage invites chocolate spot. Plants get top-heavy by August, so run a string corral around the row rather than staking each stem. Pick pods young and regularly and the plants keep producing until the heat returns.
Broad Bean at a glance
| Sowing depth | 40-50 mm |
|---|---|
| Plant spacing | 15-25 cm |
| Row spacing | 60-80 cm |
| Germination | 10-20 days |
| Days to maturity | 90-150 days |
| Frost tolerance | Hardy |
| Method | Sow Direct |
Common questions
- When do I plant broad beans in the tropics?
- Sow direct from March to May, as early in that window as you can. A March sowing flowers in the coolest part of the dry season, which is when pods actually set.
- Why do my broad beans flower but produce no pods?
- Warm nights cause flower drop without pod set — the most common broad bean failure in the tropics. Sow earlier in the March–May window and pinch the growing tips once flowering starts.
- Can I grow broad beans in Darwin?
- Yes, as a dry-season crop at the edge of its range. Sow in March, expect pods from around June or July, and accept lighter yields than southern growers see.
- How deep should broad bean seed be sown?
- 40–50 mm deep, directly where the plants will grow. Deep sowing keeps seed moist and anchored, and germination follows in 10–20 days.
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