Seen my mandarin tree? On the tree, there are a ton of mandarins. They are not only lovely, but also exceptionally sweet. Sweetly said. This tree had some green mandarins on the seedlings when I purchased it six years ago. In essence, tree growers want the trees to have some fruit on the saplings since consumers prefer to purchase fruit-bearing trees. People think that this tree will give fruit after purchase and it also has a lovely appearance. If you fall for this trap, you'll probably end up being quite dissatisfied. A few months after I purchased and planted this little tree, the mandarins on it begin to mature. We couldn't wait to sample the fully ripened mandarins.