Planting a Cercis Eternal Flame

[EternalFlame]

Dear gardening enthusiasts, I have just purchased a Cercis Canadensis eternal flame and I have potted it in a terracotta pot, a little bit bigger than the root ball. A gardener has made me aware of how difficult it is to find this tree over here in nurseries and he mentioned that if it's in a pot, somebody may steal it. My front garden is quite exposed. I was thinking of planting it in the ground for this reason but I read online that this tree in particular doesn't like to have its roots disturbed and so I am hesitating to plant it into the ground the same week. How long should I wait before repotting/replanting it? thanks!