Not sure.

If it's otherwise healthy and happy, might just need a bit of food, but then again it might just not be old enough yet.

I'd make sure it got a nice organic snack (I like BioForm followed by Dry Molasses) and see what happens.

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Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.