Green beans

Availability and types of green beans (also called garden beans, bush beans or pole beans) depend heavily on season, growing region and variety. Green beans are the pods of the bean plant harvested while still immature. They are eaten while the seeds inside are still small and tender. This makes them crunchy and mild in flavor. To help you navigate, here you can learn when green beans are available, where they come from and what types exist – simply explained and easy to understand.

Origin and cultivation
The bean plant originates from Central and South America. People there cultivated it many centuries ago. With explorers and traders beans reached Europe. Today green beans are grown worldwide in many countries because they are adaptable. They prefer warm temperatures, sun and a loose soil. In Europe they often come from regional cultivation in summer. In cooler months they are frequently imported from more southern countries, for example Spain, Morocco or Kenya. In greenhouses beans can also grow earlier or later in the year, but the largest quantities still come from open fields.

Availability through the year
In Central Europe the main season is from June to September. Then the pods are fresh, crunchy and usually cheapest. Out of season you will often find green beans as imported goods in the supermarket, and also as frozen products and in canned form (preserved in jars or cans).
- Fresh beans: best from regional markets in summer.
- Frozen beans: available year-round, already trimmed and often blanched.
- Jar/canned beans: year-round, already cooked and very practical when you need something quick.

Why are there so many varieties?
Breeders have over time developed different beans so that they vary in size, tenderness or robustness. Some grow low like small bushes, others climb on poles. They also differ in pod structure: some have a smooth, fine pod, others a fleshier one, and others still a rougher surface.

Green beans denote the immature, edible-as-a-whole pods of various garden bean varieties (Phaseolus vulgaris) from the Fabaceae family. In German-speaking regions the terms Grüne Bohnen, pole beans (climbing types) and bush beans (compact types) are also common. Botanically, these are the young pods containing seeds, harvested before physiological maturity. Characteristic are fleshy, stringless pods in modern varieties, a tender bite when blanched, and a marked enzymatic activity that makes raw consumption problematic. Green beans are a versatile culinary ingredient, rich in fiber, secondary plant compounds and minerals, while also showing notable technological and nutritional properties.

Botany and morphology
Phaseolus vulgaris originates from Central and South America and has been cultivated worldwide in modern times. The plant is annual, with trifoliate leaves, papilionaceous flowers and typical legume pods. Green beans are offered in different pod shapes: round, flat, medium-width, with lengths of about 8–20 cm. Modern cultivars are stringless (without the tough sclerenchyma threads along the seam), which improves sensory quality. Climbing pole beans require supports, whereas bush types remain compact and mature faster. The root system contributes to the symbiosis with rhizobia, which fix atmospheric nitrogen and thus improve the nutrient balance.

Nutritional profile and micronutrients
Green beans have a low energy content (typically 25–35 kcal per 100 g raw), due to high water content (about 90 %) and moderate carbohydrate content (4–7 g/100 g). They are fiber-rich (2–3 g/100 g), with soluble and insoluble fractions that contribute to gut health. Protein content is around 2 g/100 g, with an amino acid pattern typical of legumes; combining them with cereals can increase protein biological value. Micronutrient-wise, vitamin K, folate, vitamin C and provitamin A stand out.