Leafy, flower-covered broad beans that never turn those flowers into pods point to a pollination problem, not anything wrong with the plant itself. Broad beans self-pollinate but also rely on bees for good cross-pollination, and they need a fairly specific temperature window to set viable pollen in the first place — so a stretch of the wrong weather at exactly the wrong moment is usually the real story.

What's most likely going on

  • Bees weren't working when it mattered. Broad beans lean on bee activity for reliable pollination on top of self-pollinating, and wet, windy or cold spells keep bees from flying. Flowers pollinated incompletely in that window often still form a pod that then blackens and drops rather than fills out — this is the single most common reason a healthy, pest-free plant comes up short on pods.
  • Flowering landed in a cold snap. Viable pollen needs roughly 15-18°C. If flowering happens before the season has properly settled into that range, the plant will go on flowering without setting anything until it warms — nothing is actually wrong, the timing is just off.
  • The plant is under-fed or sitting too wet. A nutrient shortfall or waterlogged soil can produce a plant that flowers freely but doesn't carry those flowers through to pods. This shows up less often than the weather-driven causes, so it's worth checking mainly once you've ruled those out.
  • Aphids in heavy numbers can also drag pod set down, though that's an easy one to separate out — you'll see the colony. Full detail is in Why Are My Broad Beans Covered in Blackfly in NZ Temperate? if that's what's actually on your plants.

Why the temperate picture usually isn't about cold

Our broad beans calendar doesn't change by zone — direct sow August to October, harvest December to February, per Egmont's culture guide — and this zone's last spring frost lands in November, the same month as cool/mountain's. So frost timing itself isn't the differentiator. What is different is how quickly a temperate garden's spring actually warms. Reaching that 15-18°C pod-set threshold happens sooner and more reliably here than in a slower-warming garden, which shifts the likely explanation: if your beans are flowering well but still not podding in a temperate garden, wet or windy weather keeping bees grounded, or a feeding/drainage issue, is a comparatively more likely culprit than the plant simply being caught by lingering cold. Cool/mountain gardens see the opposite balance, where cold at flowering carries more of the blame.

What to do about it

  • Ride out a wet or windy stretch rather than assuming failure. The plant keeps producing flowers, and once conditions settle and bees are back out, later flowers usually set fine.
  • Add bee-attracting flowers near the bed so pollination has the best odds once the weather itself isn't the obstacle.
  • Remove blackened pods that have already failed so the plant's energy goes into its next round of flowers instead.
  • Feed with a complete fertiliser — Yates NZ points specifically to a fish and seaweed-based feed — if plants look pale or slow alongside the missing pods.
  • Check the bed hasn't gone waterlogged, since broad beans need workable drainage to take up nutrients even while flowering strongly.
  • Rule pests in or out by eye before you settle on pollination as the cause — a visible aphid colony changes the diagnosis entirely.

Cultivar notes

The cultivars sourced for this zone — Coles Prolific, Red Seeded, Scottish, Superaguadulce, and Suttons Dwarf — are documented for sowing method and season, not pollination or heat performance, so switching variety isn't a fix for this particular problem. The weather at flowering time matters more than which cultivar is in the ground.

Next season

If pod set is consistently patchy despite settled conditions overall, look at whether flowering is landing during your garden's worst stretch for wind or wet weather rather than cold — a small shift within the August-October sowing window can move flowering clear of that stretch, though it's worth testing in your own garden rather than treating as guaranteed.

More on this zone: see the full NZ Temperate Planting Calendar →.