I have a citrus tree of the Washington Navel variety, which is around 4 years old (and has been here for 2 of those). Naturally this means it's a scion grafted onto rootstock of which I don't know the variety.
A few weeks ago I got this branch shooting out from the middle of it, to the point where it doubles the height of the tree. The leaves are wider than those of the rest of the tree, and with its growth I worry that it's a sucker.
That's a close-up of the leaves. It also has some spines but they're not that exaggerated.
Now the thing is, from what I can see, it's coming from above the graft, which is what has gotten me confused. In fact it seems to be coming from the place all the other branches are.
So, is it a sucker? Should I have it cut down? Or is it just a branch which is growing very quickly?