Back to the Dendro... Keep in mind that with the exception of D. superbum, all my dendros gradually die. But from what I know about deciduous dendros, canes should get bigger and longer, not other way around. Nobile dendros are supposed to be deciduous. Here's what I did to assure proper growth and blossoming on superbum:
During growth period, fertilize and water daily (mine are mounts so they dry out quicker than pots.
Around end of October, withhold all water and fertilizer. The growth you see is about as big as it will get that season.
Let leaves all fall off and watch for buds forming along bare canes. This usually (at least for superbum) will be in early spring (Feb-Mar). Once buds form (probably a cm or so) start watering occasionally. For me that is twice a week. There should also be new vegetative growth starting. As buds fill out (get larger) and are well formed, start water heavily again (no fertilizer). Once flowers are out and plant is in full bloom, go back to fertilizing for next year's growth.
Here is result (notice bare canes).
According to my reference books, D. nobile requires winter rest and cool temps in winter.
Others may have direct experience, but I feel the fact all the canes have leaves and are getting thinner points to lack of winter rest - it's growing itself to death. Hope this helps.
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