Landscape view of two tractors moving across planting agricultural fields of courgettes on 17th June 2020 in Hartlebury, United Kingdom. The zucchini or courgette is a summer squash, of Mesoamerican origin, which can reach nearly 1 metre in length, but is usually harvested when still immature at about 15 to 25 cm. A zucchini is a thin-skinned cultivar of what in Britain and Ireland is referred to as a marrow.