John,
thank you very much for your response!
Climate-wise, I'm near Houston, TX (zone 9a). Last winter, we lost two citrus trees although they were well rooted and covered. This is the reason why I'm planning to wait till spring especially since my Navel is grafted on sour orange roots... The west side spot has a better protection from wind (my neighbor on the other side has no fence since Ike).
And yes, I am interested in citrus! As well as in other fruits... Therefore, the spot not taken by the Navel will be taken by an apriun tree.
I think 5 citrus trees are already too much for our .15 acre lot.
Thank you very-very much again!!