For best results start cucumbers in pots in March and plant out in a polytunnel or glasshouse in April/May. Some varieties are well suited to outdoor growing and will withstand lower temperatures. Outdoor cucumbers should be planted a bit later (mid May) to avoid any risk of frost damage.
Cucumber growing calendar
The cucumber belongs to the gourd family (Cucurbitaceae) and the genus Cucumis of which there are 20 to 25 species found mostly in Asia and Africa. It is likely to be native to India where it has been cultivated for at least 3000 years. The cucumber was probably introduced to Europe by the Greeks or Romans and there is evidence that it was common in England in 1327.