Posted: 16/05/2017 at 13:34
I think you should read it all again. Seed grown plants may take 20 or more years to produce a flower and it may not be the same as the parent. A successful cutting will produce flowers in 2 or 3 years.
You can try one or all of 3 methods:-
layering, where you peg a stem to the ground or into a pot of compost and wiat for roots to grow before severing it from the parent and potting on.
soft shoot cuttings in spring to mid summer
hardwood cuttings in winter
The RHS thinks layering is the most reliable. See here for more info - https://www.rhs.org.uk/advice/profile?pid=173