How to get a white venusta

There are hybridizers and seed collectors .The hybridzers can 
strive to reach a certain goal much more directly The seed collectors 
are dependent on the bees and they rarely what you want them to do 
Especially recessive characters like pure white flowers will rarely 
be obtained. Lets give an example.
How now to obtain a white venusta
1.cross sieboldii Alba or Snow Flakes with venusta 
The first generation (F1) will be all the same and all with purplish 
flowers So keep only a few say four . 
In the next generation thereare two possibilites 
a>or you make a backross tosAlba This will give you 50%white 
flowers but a plant more like sAlba and that is not what we wanted
b> We can backcross with venusta The plant will approach venusta but 
only half the seedlings will inherit white and none of the seedlings 
will show any white, so this is pretty useless too
 The only real option to get venusta-like plants with white flowers 
is to cross the first generation ( F1 ) plants with itself . That way 
25 % of the offspring will be white. More important the plant-form 
will range from venusta-like plant to s Alba-like plants So to have 
a white flowered venusta-like plant you most grow in the 
second generation as many plants as possible! That will not be easy 
as sAlba x venusta is not very fertile, as most crosses bewteen good 
species.
 any questions ? just ask
Ben J.M.Zonneveld
Clusius lab pobox 9505
2300 RA Leiden
The Netherlands
Zonneveld@RULbim.LeidenUniv.NL
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