Clem likes
Partial shade
They likes to keep their roots cool.They'll give the best coloured blooms in partial shade (full sun will bleach the flowers). A spot with morning or evening sun is perfect.
Moist soil
They like gritty, well drained soil to stay moist, so give them a little drink if it hasn't rained in a while - just make sure their soil is dry first. Climbing walls is thirsty work.
Haircuts
Although pruning isn't essential, you can give them a trim after flowering to maintain their shape.