I have not, and would be thankful for any advice you have.
Where we live they do great in full or partial sun provided they never dry out completely - not hard to do if you mix that fast draining with a little peat.
They grow fast when happy, ours grow so much in our short growing season they must get a lot of cutting back to get inside for the Winter.
They grow in that fashion once root bound, we leave ours root bound two to three years before we either trim of 1/2 inch all the way around and off the bottom of the roots, refilling with substrate using the same pot. If you up pot - don't go more then an inch in width and depth allowing them to get root bound quickly again
Green cuttings do not take and grow, hardwood cuttings have a decent success rate of 50 percent and up North that is very good.
Unless rinsing off pollen or whatever avoid foliar watering.
We fertilize in Spring, Summer prior to our two week hell hot spell, late Summer early Fall prior to chop and bring in.
That growth comes with being root bound and when it happens all will make sense to you, pushing growth with sun, nutrients, etc... is of no use and stresses them.
Once they do start that growth with minimal care as above you will be cutting it down from 4 foot wide and tall to 8 inches and have a two to three foot tall plant to take outside in the Spring - we cut a lot of that off, rinse and repeat.
Down the road when that happens you can force Bracts but until then trying that again will just stress it.
They are really great plants even up North, we just need to adjust and be patient as with most plants.
Good growing and PM if you want to call for details I have not covered! I field a LOT of calls being retired.
Grimmy
