When and how to take Berberis Julianae cuttings?

Hi! You need to take semi-hardwood cuttings for best chance of success. From this seasons growth around mid July - early Autumn, select a lateral shoot and prune off. Do this in the early morning if you can as the plant is full of water then. Pot up right away is best but if you can't then make sure you keep the cutting moist and cool.
The cutting needs to be around 4-6" long. Remove the leaves from the lower third to half of the cutting then plant up to this depth in your compost. Water in well then leave to settle in until the Spring then pot up or plant out as you need.
Good luck