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Hi Fred - this is also for me one of the species which cause some trouble.I think the problem I have/had with it are to hot temperatures and to dry soil in summer. Rhizomes are quite small and so they tend to dry out to excessively - a problem which seems to be easier controlable in central europe. Now I have planted the plants in the shadow (north of a wall where my other "northern" Oncos grow - until now they seem to like it, the leaves are allready up to 15 cm long (what does not cause any problems here as light intensity is high and will get any frost).
So I will hope to have better results in future with this beautiful plants. Nearly all Oncos grow in mineralic/chalky heavy soil here and cannot say I am dissatisfied with the results using only small quantities of synthetic fertilizers with low nitrogen. Also to high phosphorus concentration seems to be dangerous as it may result in plants which might flower to death - so, as so often: less might be more
Very interesting discussion folks !! Learning a lot here !! Thanks and please don't let me interrupt the discussion