4.5L container fig tree - pot up slowly or pot straight into large planter?

in Plants
Hi everyone, I just received my Christmas present early - a beautiful Brown Turkey fig tree
I have a container for it - a 40cm x 40cm x 44cm planter (https://www.primrose.co.uk/h43cm-classic-planter-nutmeg-p-132707.html), but the tree is still small. It arrived in a 4.5L pot.
Do you think I'd be ok planting the fig straight into the planter, or shall I pot it into something smaller first and move up gradually?

Do you think I'd be ok planting the fig straight into the planter, or shall I pot it into something smaller first and move up gradually?
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Any way I think in your position I'd put it in a slightly larger pot then plant that pot in the planter for effect, it would also keep the roots that bit warmer. 😉
I'm confused.
Never heard of fig called a dog tree.
Dog wood...yes...that is Cornus.
My neighbour has an old, fruiting Brown Turkey fig tree but because they do not like figs *he who knows everything* just cuts it down hard every few years. What a waste! His philosophy on gardening is, stick it in the ground and let it get on with it. No comment other than, each to his own.