Lonicera sempervirens John Clayton, 3LA trumpet honeysuckle, Lonicera Sempervirens John Clayton is a compact, semi evergreen climber which bears tubular yellow flowers, followed by red berries which are much enjoyed by the birds. Although it lacks the scent of other honeysuckles, it is a native, non invasive variety that has a fantastic twining ability, enabling it to effortlessly cover walls, fences or pergolas.