Kay wrote:

They're a bit iffy while small - sensitive to drought and to cold winds.
If it hasn't been raining for a few days, give it a couple of gallons of
water, and do this for the rest of this season. And this winter, give it
a rough windbreak - though at three foot it should be toughening up a
bit.

I think it is also as well to remember that this (Araucaria araucana)
is a potentially massive growing tree (100 feet or more) with a root
system evolved to coped with the rugged, rocky soils of a
mountainside. Consequently, the roots delve very deeply needing lots
of vertical space and t is very difficult to provide this within the
confines of even the largest of pots. A. araucana has to be planted
out eventually if it is to develop into a well balanced, healthy tree.
Rather like quite a few of the larger pines, they simply do not enjoy
permanent confinement in pots and will deteriorate over a period of
time.

I don't know what size the pot is, but if I was keeping a 3 footer in
a container, I would select one that is much deeper than wide and
probably opt for a conventionally sized plastic dustbin with plenty of
drainage holes drilled in the base. Even this will only suffice for 4
or 5 years and then you have the exceptionally painful and difficult
task of planting it out. My advice is to plant in a suitable spot
(sunny, well drained and at least 30 feet away from your house) as
soon as possible. The present warm, wet conditions will aid rapid
establishment.

HTH
Dave Poole
Torquay, Coastal South Devon UK
Winter min -2°C. Summer max 34°C.
Growing season: March - November