what causes brown tips on roots in water propagation and how to prevent root rot? Catkins are everywhere! What's a catkin? They are the pollen producing (male) parts of wind pollinated trees like alder, willow, and cottonwood. You can see them dangling from the branches, but you can also What biofuels are and how they are produced Mushrooms Growing Garden Pot Inside Former Stock Photo 2200591533 Shutterstock