The present invention relates to a cucumber plant of the species Cucumis sativus carrying a genetic determinant that leads to a darker green stem in the seedling stage that is predictive of a darker green colour of the fruits as compared to an isogenic cucumber plant not carrying the said genetic determinant, which genetic determinant is as comprised in a cucumber plant representative seed of which was deposited with the NCIMB under deposit number NCIMB 41859. The genetic determinant is suitably introgressed into the cucumber plant from a cucumber plant of which representative seed has been deposited with the NCIMB under deposit number NCIMB 41859.