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Climbing beans

 

The subtle pink flower of climbing French bean cobra Harvested purple pods of French beans Cosse Violette

The delicate pink flower of climbing French bean var. Cobra; just harvested French beans var. Cosse Violette.

 

 

Climbing beans are tall, viny plants that grow upwards off the ground by twisting round any support that the vines can find. Prized for their tender, fleshy pods, the two most popular types are runner beans (the first choice among British gardeners) and French beans (which are not French at all).

 French bean shoot climbing up a bamboo cane.

The shoots of climbing beans twist around the support provided

 

Both types originated in the New World and found their way to Europe after Columbus’ voyages of exploration. The plants are frost sensitive and heat loving, and despite their immigrant status, they are well-adapted to growing outdoors during the British summer.

Both French beans and runner beans are also available as dwarf versions. There are many varieties of dwarf French beans in the catalogues; dwarf runner beans generally are not so common. Though dwarf varieties are popular, there are many reasons why the climbing ones make a better choice for home gardeners. Not only do they have a longer harvest period, but they can produce higher yields from the same number of plants. They are also easier to pick – the pods are more visible, and harvesting can be done standing up. The only disadvantage is the need to erect some sort of structure to support the plants, but this is not a particularly difficult or expensive job.

Dwarf French beans      

Dwarf French beans var. Cantare. There are many varieties of dwarf French beans available in the cagalogues.

  

Growing the beans

Because they are tall growing, climbing beans should be sited in a sheltered spot protected from the wind – otherwise, they can be blown over. The soil should be well-drained, well-fertilized and worked to a good tilth, allowing the plants to thrive rather than just survive.

After the soil is prepared, it’s time to erect a structure that will support the vines. A number of support systems have been devised, though probably the quickest and cheapest one to construct is a wigwam made from bamboo canes 1.8 or 2.4 meters long. Use 6 to 8 of these canes, and space them equidistant from each other in a circle 1.2 to 1.5 meters in diameter. Force the canes into the ground, then tie them together at the top with strong twine. If growing more that one wigwam, leave about a meter spacing between the edges of each ­– this will give enough room to harvest.

Runner bean teepees

A row of wigwams with climbing beans

Once the wigwam has been erected, start the crop by sowing three seeds 4 to 5cm deep at the base of each cane. If the soil is too cold, the seeds will rot rather than germinate, so sowing should be delayed until the temperature warms up. In South England, this will normally be sometime from mid to late May, though it could be later in chilly springs. When germination is complete, thin the seedlings down to leave the two strongest at each post.

An earlier crop is possible by first producing transplants in a greenhouse, conservatory or south facing window. Sow 3 seeds in pots 7 to 8cm in diameter, and thin down to the two strongest seedlings after emergence. Sowing can commence as early as the middle of April, and the young plants will be ready to go outside about four to six weeks later. At this point, transplant two plants next to each cane, watering the soil to settle it around the roots.

Germinating french beans 

French bean seedlings just emerging.

 

As the plants start to grow, twist the vines around the canes to train them upwards. After this initial bit of help, they will begin to climb on their own.

Young bean plants

Young plants of climbing French bean var. Cobra

 

Under no circumstances should the soil be allowed to dry out. Pay particular attention during dry spells, being sure to water regularly once flowering begins. Spraying runner bean flowers with water on hot, dry days is often recommended to help pod set, but this is a gardening myth that has no obvious benefits.

Picking the bean pod

There is a tendency to pick the pods when they are old and too tough to be thoroughly enjoyed. When this happens, the walls get stringy and the seeds inside start to swell up with starch. It is better to pick the pods when they are young – not only are they sweet and tender, but the plants will produce bigger yields.

 Harvested runner beans var. Snowstorm Runner beans should be picked when the pods are young

Runner bean var. Snowstorm. Runner bean pods should be picked when they are still young and very tender.

 

Pest and diseases

Both French and runner beans are quite free of bothersome diseases, which makes control measures such as spraying unnecessary. Runner beans can get black fly (aphids), but generally infestations do not spread and evenually get controlled by natural predators. Unfortunately, slugs and snails will devour young plants, but nightly collection trips to the garden will put a stop to that. To prevent problems from developing, rotate your beans by growing them only one year in four in the same part of the garden.

 

Bean variations

Runner beans can have red or white flowers, or a combination of both colours, and a few varieties are now available that have salmon pink flowers. The pods, however, are always flat and green. There is, however, an extensive choice of varieties, and two worth growing are Aintree (red flowered) and Snow Storm (white flowered).

Red runner bean flowers Snowstorm runner bean flowers

Two runner bean: var. Aintree (red flowers) and Snowstorm (white flowers)

 

The pods of climbing French beans are more variable and can be round or flat, short or long, and green, yellow, purple or speckled. Three high yielding varieties are Cobra (round podded and green) and Hunter (flat, wide and long and green podded), and Cosse Violette (flat and purple podded). 

Cosse Violette is a climbing French bean producing flat purple pods  Yellow french bean

Variable French beans pods are very variable: var Cosse Violette (purple, flat pods) and Gold Marie (yellow, flat pods).

Green, flat pods of French bean Hunter Round, green pods of French bean Cobra

French beans pods are very variable: var Hunter (green, flat pods) and Cobra (green, round pods).

 

To conclude on beans

Climbing beans require little effort to produce good yields of pods. Pests and diseases are seldom problematic, and there is a good selection of varieties to suit most tastes. This is an easy-to-grow vegetable that is tops for convenience and dependability – what more can a vegetable give?

 

 

© Michael Michaud