Q.Sucker or not?
I got a tree from my grandparents, a young kumquat tree. I basically have no experience on trees but am researching.
There seems to be a branch different from the others, the leaves look the same but it is kind of low. Is this a sucker?
Certified GKH Gardening Expert
Depending on that tree was propagated, there may not be a graft point. It still looks an awful lot like the original tree.
Still... It is a very low branch, and will be more of a nuisance than it is worth later on. If it were me, I would cut it off and only let new growth grow on the branches above the fork. This will keep the shape of the tree, and preserve its single trunk later on.
This article will give you more information on the care of these: https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees.htm