A: Thorns on citrus trees develop at the nodes, often sprouting on new grafts and fruiting wood. Some citrus trees with thorns outgrow them as the tree matures.

The bark-covered trunk supports a framework of branches and twigs known as the tree's crown. Branches, ... Thorns and spines can occur on twigs and are unique to certain trees.

The Osage orange hedge row tree, ... Its bark is deeply ridged and orangish-brown, while branches bear sharp thorns and release a milky sap when broken. Growing 30-50 feet tall, ...

It one-inch thorns are thick enough to shred tires on a tractor if you drive over fallen branches. And the trees have a weak structure, making the branches and limbs easy to snap in strong winds ...