My pole bean plants are lush and green but I'm getting very few beans — why?
Pole beans drop flowers and fail to set pods when temperatures exceed 90°F during the day or when given too much nitrogen — excess leafy growth at the expense of production.
Beans are warm-season but not heat-tolerant at the temperature extremes. Above 90°F, pollen becomes non-viable and flowers drop without setting pods. This heat drop can halt production for 2–3 weeks during a heat wave, then resume when temperatures moderate. Lush plants going into July with minimal pod set is often simply a heat timing issue — the plant is ready and healthy, but the temperatures aren't cooperating.
Nitrogen is the second major cause. Beans fix their own nitrogen through root bacteria (Rhizobia), and in nitrogen-rich soil they may not form effective root nodules — they rely on the available soil nitrogen instead and redirect energy into leafy growth. If you amended the bed heavily with compost, manure, or nitrogen fertilizer before planting beans, the plants can grow very large and green while producing few pods. Beans generally do better in moderately fertile soil than in heavily amended soil.
Planting density can be a factor too. Very crowded pole beans shade each other and compete for resources; pods set in shaded interior positions may be few and small. The rule of thumb is 6 inches between seeds along the trellis, or 4–6 inches for a double row.
Harvest frequency also affects production. Beans, like most pod crops, are biologically motivated to produce seed. If you leave mature pods on the plant, it slows or stops producing new flowers — its reproductive goal is being met. Harvest every 2–3 days, picking pods while they're still slender and before seeds swell, and the plant continues producing through the season.
- AphidSoft, clustered insects on new growth causing curled leaves and sticky honeydew.
- Blossom DropFlowers fall before setting fruit, often during temperature extremes or after weather stress.
- Gray Mold (Botrytis)Gray-brown fuzzy mold on fruit, flowers, or stems — soft, collapsing tissue beneath the coating in cool, wet conditions.
- Brown Marmorated Stink BugSunken, corky dimples on fruit and pods caused by a mottled brown shield bug feeding through the skin.
- Cabbage MaggotBrassica transplants wilting and dying as white maggots tunnel through roots at or below the soil line.
- Can you give a plant too much nitrogen, and what does it look like?Yes — excess nitrogen produces very dark green, lush leafy growth at the expense of flowers and fruit, and in high concentrations can burn roots and cause wilting.
- My tomatoes wilt every afternoon in hot weather — is something wrong?Midday wilt on hot days is often a normal, temporary response to heat load — if plants recover by evening, the roots are functioning and the wilting is a water conservation mechanism, not distress.
- Why do my bean leaves have rust-colored spots?Rust-colored or orange-brown pustules on bean leaves are bean rust, a fungal disease that spreads in warm, humid conditions and is manageable but rarely fully eliminated once established.