Posted by Gus on 5/14/2008, 2:46 pm, in reply to "pruning and growing seedlings of Eucalyptus saligna"
Link: Eucalyptologics: Information resources on Euc cultivation worldwide
83.37.155.101
There could be several factors causing that branching if it is really excessive. If you are growing in sterile substrate (or very poor in nutrients), you have almost no P, and plants do need it too, especially if the tubes are leaching with regular irrigation? But it could be other things too.
What is sure is that I agree with George you could safely grow them outdoors by this season. Some hardening will not harm (unless you bake them!). And it is not very advisable to prune so small seedlings in high humidity and very warm conditions as in a greenhouse, as they are too fragile to resist any thriving damping off or similar type of nuisance that can be happy in those conditions.
If you can take some photo and post it here or email it, maybe it is easier to know. If so, choose one "normal" seedling and "the most branchy" to compare 
Cheers to Mills 
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