tapla, Is your variegated Brugmansia Snowbank? I've read your post and find it very interesting.
When I first started out with Brugmansia I posted my cutting brugmansia roots and boy did I get screamed at by the pros. I used to have them in huge pot but as I have gotten older I have learned the easiest way to keep them is in 5 gallon pots sunk into Pickle buckets. Especially after planting them in the ground and having to dig them out of the ground yearly to put them away for the winter months. After years of growing, I have learned Brugs love to be root bound to produce blooms. I will admit I use the Bloom Booster early in the year. As a majority of ours are well over 10 years old, some are 20. Yes, they can live a long time if given the right conditions and yes you can over fertilize them! It really depends on the variety and care give to the Brugmansia if one can get it to bloom but most will not bloom until fall. This is why I suggest a bloom booster to kick in the blooming process earlier in the season. It only takes a couple feeds of the bloom booster to get them to bloom. Just don't over use it!
