Green bean.

At a glance

Care level

Easy

Plant type

Annual vegetable

Light

Full sun

Indoor light

direct

Water

Every 2 to 4 days

Mature size

Up to 300 cm for pole types

Growth rate

fast

Hardiness

USDA 3 to 10

Bloom time

Mid to late summer

Care

Provide consistent moisture and support for pole varieties to ensure healthy growth. Watch for common pests like aphids or bean beetles on the undersides of leaves. Harvest pods frequently to encourage the plant to keep producing throughout the season.

Watering

Keep the soil consistently moist but not waterlogged.

Feeding

Apply a balanced fertilizer once early in the season.

Pruning

Pruning is generally not required, though removing dead foliage helps.

Repotting

These are annuals and are not typically repotted.

Soil

Well draining, fertile, loamy soil

Soil pH

6.0 to 7.0

Temperature

15 to 30°C

Humidity

40 to 60%

Drought tolerance

low

Lifespan

Annual, typically 3 to 6 months.

Deer and rabbits

low

Safety

People

The raw seeds are toxic due to phytohaemagglutinin content.

Pets

Raw beans contain lectins that can be harmful to pets if ingested in large quantities.

Children

Keep raw seeds away from small children as they pose a choking hazard and are toxic if ingested.

Contact allergens

Some people may experience mild skin irritation from handling the fuzzy foliage.

Airborne allergens

There are no significant airborne allergy concerns associated with this plant.

Edibility

Raw beans contain lectins that must be destroyed by thorough cooking to avoid severe digestive distress.

How to identify it

• trifoliate compound leaves
• slender green edible pods
• small white or purple flowers
• twining stems on pole varieties

Height

0.3 to 3m

Spread

0.2 to 0.6m

Leaves

green, deciduous

Flowers

white, purple, pink, 1 to 2cm

Fruit

green, yellow, purple, Summer to early autumn

Common problems

• Mexican bean beetle — These beetles skeletonize leaves and can quickly defoliate plants.
• Anthracnose — A fungal infection that causes dark, sunken lesions on pods and stems.

Growing it

Propagation

seed

When to plant

spring, early summer

Overwintering

This plant is an annual and will die with the first frost.

In containers

Bush varieties grow well in containers at least 12 inches deep.

Planting beans with corn and squash creates a classic Three Sisters garden that benefits all three plants.

Grows well with

• Corn — Corn provides a natural trellis for climbing bean varieties.
• Summer Savory — This herb helps repel bean beetles.

Keep away from

• Onions — Onions can stunt the growth of beans when planted too close.

Similar species

• Runner Bean — These are also climbing beans but have showier flowers.

Science

Family

Fabaceae

Genus

Phaseolus

Order

Fabales

Class

Magnoliopsida

Native range

Central and South America.

Conservation

This species is widely cultivated and not of conservation concern.

It thrives in warm, sunny environments and relies on symbiotic bacteria to fix nitrogen in the soil.

Value to wildlife

nectar source

Pollinators

bees

Uses

culinary vegetable, cover crop, nitrogen fixer

Taxonomy resolved against GBIF.

Questions people ask

Can I eat the pods raw?

Green beans are generally safe to eat raw, but dry beans must always be cooked.

How do I know when to harvest?

Harvest when pods are firm and seeds are just beginning to swell.

Where the name comes from

Phaseolus is derived from the Greek word for a boat, referring to the shape of the pods. Vulgaris simply means common.

Good to know

• Beans are legumes that enrich the soil by fixing nitrogen.
• There are over 4000 varieties of common beans.
• They were one of the Three Sisters planted by indigenous peoples.