(botany,agronomy) A fruitcane in its first year of growth, especially that of a bramble.
2007 July 25, David Karp, “At Last, Sweet Blackberries Stay the Course”, in New York Times:
But Courtney Weber, a breeder at Cornell University, is working with Mr. Clark’s primocane selections to develop varieties that could be mown down before winter and fruit the next year.