Another Buddliea Question


Several yards around here have B. alternifolia standards, and they are rather attractive.  That has made me have a desire to plant one.  On three occasions, I have purchased a plant, intending to put it in.  Then, I've had trouble finding a place for it.  I actually planted it one of the three times.  On each of those occasions, either the first year or second, the alternifolia dissappeared and was replaced by B. davidii.  My current one bloomed once this spring, with alternifolia flowers, and is blooming again now with 18" white spikes, that are doubtlessly davidii!  
 
The obvious question is:  are alternifolia plants usually a scion on a davidii rootstock?  Alternately (NPI),  Is alternifolia a weak, unstable sport of davidii?
 
I have davidii and weyeriana hybrids that are doing just fine, but I can't figure out the alternifolia thing.

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Robert L. Chehey
c*@micron.net
Boise, ID, USA, USDA Zones 6a, 6b. Heat zone 7

Cold, Mediterranean Shrub-steppe
and frondose riparian forest
N43º38.67'  W116º13.68' Altitude: 816M
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