Exotic fruit trees are not poisonous per se. Occasionally, however, consumption is associated with stomach problems and discomfort. You can find out here whether these concerns apply to the exotic calamondin.
The calamondin is edible like other types of orange, albeit a little less sweet
Calamondin oranges bring sour fruit enjoyment
Her calamondin tree is a cross between a tangerine and a kumquat. A citrus mitis owes its easy care to the robust kumquat plant. The botanical relationship with the tangerine is evident in the shape and color of its fruit. As a result, calamondin oranges are not poisonous but safe to eat.
If the fruit is too sour to eat fresh, you can make jam with it. In combination with other exotic fruits, calamondin oranges give your fruit punch or rum pot a unique aroma. Although the peels are not edible, they can still be dried and grated to enhance your favorite tea blend.