The lost 19th-century delicacy that was resurrected through modern genetic breeding

Gardening · Published 2 October 2026 Swipe more like this →

In short: Long thought to have vanished from cultivation by the mid-20th century, the snap pea is a triumph of agricultural science. Unlike their flat, thin-walled snow pea cousins, these thick-walled pods offer a unique crunch, but their modern existence relies on a specific 1952 mutation.

While 19th-century French literature once celebrated a variety known as 'butter pea,' this specific cultivar was largely lost to history by the middle of the 1900s. The snap pea we recognize today is actually a modern reconstruction. The process began in 1952 when Dr. M.C. Parker discovered a mutation in a shelling pea. Researchers in Twin Falls, Idaho, later used this mutation to cross-breed with a snow pea cultivar, aiming to solve the common gardening problem of twisting and buckling pods.

The result of this scientific endeavor was the 1979 release of the 'Sugar Snap' variety. Unlike English peas, which are primarily grown for the seeds inside, snap peas are prized for their edible, thick-walled pods. These pods are structurally different from snow peas; they lack a membrane and do not split open when they reach maturity. At their peak, the pods typically measure between 4 and 8 centimetres in length and house anywhere from three to nine individual peas.

For the gardener, success with these cool-season legumes requires specific environmental controls. They thrive in soil with a pH between 5.8 and 7.0 and need at least 4 to 6 hours of daily sunlight. Because they possess a vining habit, they require a trellis or support system to manage their growth, which typically reaches heights of 1 to 1.3 metres, though some cultivars can climb up to 2 metres. While they can tolerate light frost during their youth, careful planting—roughly 25–40 mm apart—is essential for a healthy harvest.

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