Vegetable · Fabaceae
Fava Bean
Vicia faba
Sow them into cold spring soil, give them sun and steady water, and these hardy broad beans crop early while the weather is still cool.
Full sun
Every 5–7 days
75–90 days
USDA 3–8
Overview
Fava beans are one of the oldest crops people grow, a cool-season legume that shrugs off cold the way few vegetables can. Tall, upright, and squarish in the stem, they carry their flowers and fat pods close to a sturdy frame. Gardeners also know them as broad beans, and that name fits the wide, flat seeds tucked inside each velvet-lined pod.
What sets favas apart is their love of cold. You sow them while most beans are still weeks from going out, either in early spring as soon as the ground can be worked or in fall where winters stay mild. Being a nitrogen-fixing legume, the plant feeds itself and even leaves the soil richer for whatever follows.
They ask little and give back early. Plant them in good ground, keep the soil evenly moist through bloom and pod fill, and watch for black aphids on the new tips. Get the timing right so flowering lands in cool weather, and you pick tender pods and beans from late spring into early summer.
Care
The short version: full sun and cool weather, deep well-drained soil with plenty of organic matter, and steady moisture through flowering and pod fill, with little feeding needed since the plant fixes its own nitrogen.
Light
Favas crop best in full sun, though they will take a little partial shade and still set pods. Plenty of light keeps the tall stems sturdy and the flowering heavy.
Water
Keep the soil evenly moist through germination, flowering, and pod fill, which usually means a deep drink every 5 to 7 days. Don't let it swing between bone dry and soggy, and ease off in cold, wet soils where waterlogging rots the seed.
Soil
Plant in deep, well-drained loam with plenty of organic matter worked in. A pH from 6.0 to 7.5 suits them, and the deep, free-draining ground gives the strong taproot room to run.
Temperature
This is a true cool-season crop, hardy down to about 14°F (-10°C) and happiest below 77°F (25°C). Heat at flowering is the enemy, since it makes the blossoms drop before they can set pods.
Humidity
Ordinary outdoor air around 40% to 60% is fine, so there's no number to fuss over. Airflow matters far more than humidity here, because crowded, damp leaves invite chocolate spot.
Feeding
As a nitrogen-fixing legume, the fava feeds itself and rarely needs extra nitrogen. On poor ground, work in a little phosphorus and potassium at planting and leave it at that.
Pruning
Once the lowest pods begin to set, pinch out the soft growing tips. That single move robs black bean aphids of the tender shoots they crave and pushes the plant's energy down into filling the pods.
Size & spacing
Plants stand 3 to 5 feet (90 to 150 cm) tall and stay fairly narrow at 12 to 18 inches (30 to 45 cm) across. Give each one that much room so air moves freely and chocolate spot has less of a foothold.
When to plant
Fava beans want the cold that stops most beans cold. Sow them straight into the ground in early spring as soon as the soil can be worked, or in fall where winters stay mild, and pick tender pods from late spring into early summer before the heat shuts the plant down.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Direct-sow in early spring as soon as soil is workable, or sow in fall in mild-winter (zone 7+) climates for overwintering.
- Harvest: Harvest tender pods/seeds in late spring to early summer.
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Most fava bean trouble shows up on the new growth at the top of the plant or on the lower leaves in damp weather. Catch the early signs and a small problem stays small. Match what you see below, then act while it still does some good.
Reddish-brown spots that blacken the leaves in wet weather
This is chocolate spot, a fungus that thrives in cool, damp, crowded conditions and can blacken whole leaves once it spreads. Open the planting up with wider spacing, strip off the badly marked leaves, and keep water off the foliage. Good drainage and a light hand with nitrogen go a long way toward holding it back.
Fix:
- Improve air circulation by wider spacing
- Remove and destroy badly affected foliage
- Avoid overhead watering
Black aphids swarming the soft growing tips
These are black bean aphids, and they head straight for the tender new growth at the top of the plant. Watch for ants farming them and a shiny film of honeydew that turns sooty. Pinch off the worst tips, knock the rest down with a hard jet of water, and reach for insecticidal soap only if a colony hangs on.
Fix:
- Pinch off and destroy heavily infested growing tips
- Dislodge colonies with a strong water spray
- Use insecticidal soap on persistent infestations
Flowers drop and the pods never set
When the plant looks green and vigorous but the blossoms fall without forming pods, heat during flowering is usually the cause. Favas are a cool-season crop and abort their flowers once a hot spell hits at the wrong moment. Keep the soil evenly moist through bloom and pick the pods you do get, then time next year's sowing so flowering lands in cool weather.
Fix:
- Maintain even soil moisture during bloom
- Harvest existing pods promptly to encourage continued set
Toxicity
Fava beans are a food crop, and the plant is safe to have around cats, dogs, horses, rabbits, livestock, and poultry. For people, cooked beans are wholesome and nourishing, with one important exception: anyone with the inherited G6PD enzyme deficiency can suffer a serious blood reaction called favism from eating the beans or even breathing the pollen, and they should avoid the plant entirely.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Fava plants aren't a poisoning risk for cats, so a nibble of leaf or pod is nothing to worry about.
Dogs None
Dogs can be around the plants safely, and the ASPCA doesn't flag favas as toxic. A large mouthful of raw beans may just pass as a bit of gas or loose stool.
Horses Safe
Horses tolerate fava foliage without trouble, which is how the old name horse bean stuck.
Rabbits Safe
Rabbits can graze the leaves and tender pods with no harm; introduce any new green slowly, as you would with any fresh forage.
Livestock Safe
Cattle, goats, and sheep eat fava beans as a feed and fodder crop, so the plant poses no real danger in the field.
Birds Safe
Backyard poultry can pick at the beans and greens safely, and favas are grown as a bird feed in places.
People Safe
Cooked fava beans are a wholesome food for most people. The one real exception is anyone with the inherited G6PD enzyme deficiency, who can suffer a serious blood reaction called favism from eating the beans or even breathing the pollen, so they must avoid the plant entirely.
Human food-safety note: people with the inherited enzyme deficiency G6PD (favism) can develop acute hemolytic anemia from eating fava beans or even inhaling the pollen. This is a human genetic-condition concern, not a pet toxicity or general toxicity issue.
Varieties
Plenty of fava bean varieties exist, but a few turn up again and again in home gardens. These are the ones worth knowing by name.
Aquadulce
A very hardy long-pod type that gardeners reach for when sowing in autumn to overwinter in mild climates.
Windsor
The classic broad, flat-seeded bean carried in short pods, grown above all for its rich flavor.
The Sutton
A dwarf variety that tops out around 12 inches (30 cm), which makes it a good fit for small beds and windy, exposed sites.
Companions
Fava beans pair well with hungry crops that draw on the nitrogen they leave behind, and sit poorly next to onions and garlic, which many gardeners find hold legumes back.
Plant near
brassicas: As a nitrogen-fixing legume, fava beans can precede or accompany heavy-feeding brassicas that benefit from improved soil nitrogen.
Keep apart
onions and garlic (alliums): Alliums are commonly cited as poor companions for beans and other legumes.
How to propagate
Fava beans are about as simple to grow from seed as a vegetable gets, sown straight into the ground where they will spend their whole short life.
SeedEasy
Direct-sow in early spring as soon as soil is workable, or in fall in mild-winter climates. · 1 to 2 weeks to germinate in cool soil
Start favas right where they will grow, since they establish fast and resent being moved. Push the seeds about 2 inches (5 cm) deep into cool, workable soil in early spring, or sow in fall where winters stay mild. They break ground in 1 to 2 weeks even when the ground is still cold.
Myths
Fava beans are toxic to everyone and unsafe to eat.
Cooked fava beans are a safe, nourishing food for most people. The real exception is anyone born with the G6PD enzyme deficiency, who can suffer a serious blood reaction called favism from eating the beans or breathing in the pollen. That is an inherited human condition, not a poison in the plant itself.