Oenothera L. has been suggested as a new seed-oil crop suitable for Patagonia.
O. mendocinensis attained a critical size during the first year.
O. biennis attained a critical size after two years in the field.
Leaves and roots biomass declined by senescence after bolting in O. mendocinensis.
Early senescence and small plant size limits yield in O. mendocinensis.