Hibbertia scandens 
1 metre high x 2 metres wide if no climbing support
3 metres high x 2 metres wide if trellised
 
Twining climber or groundcover, broad dark green leaves and large bright yellow flowers loved by bees and pollinating insects. Ideal climber for fences, pergolas, and buildings. If no climbing support it will sprawl along the ground. Not fussy about sun, soil though does appreciate regular moisture. Prune to maintain compact habit.