* Willow trees: Both weeping willows and other willow species produce catkins.
* Birch trees: The drooping catkins of birch trees are a characteristic feature.
* Alder trees: Alder trees have both male and female catkins.
* Hazel trees: Hazel trees produce long, dangling catkins.
* Poplar trees: Poplar trees have long, cylindrical catkins.
* Oak trees: Oak trees have catkins that are less conspicuous than those of other trees.
It's important to note that not all trees with catkins produce them at the same time of year. Some trees produce catkins in the spring, while others produce them in the fall.
Do you have a specific type of catkin in mind? If you tell me more about the catkin you are interested in, I can help you identify the specific tree it grows on.
