Remember that my experience is based on very small quantities and as such are subject to random chance.
Fertiliser.
In my search for a south-west eucalypt suitable controlled release fertiliser I read the following article from SGAP:
http://www.hotkey.net.au/~sparrows1/sgap/sgap7a.html
whilst I didn't find 'Nutricote blue' on my local shelves, some googling did reveal it's NPK values.
Subsequently I used Nutricote Outdoor Garden & Shrub for some seedlings and Osmocote Plus roses superfeeder for others.
Growth between the two was comparable, however the leaf edges began to yellow on the Osmocote fed seedlings.
Sun.
In their natural habitat these guys surge into action when an opening in the 40m canopy is created above them. They do not like more than about an hour of direct sunlight per day.
Moisture.
These guys come from a moist self-contained ecosystem, they do not like dry wind. Instead of watering periodically on hot days I have a single 'mist' jet between the pots set to a very low flow rate. (Imagine the on again off again drizzle of a Melbourne winter).
Red.