5 Assorted Tree Conk Fungi Mushrooms 4 TO 6 INCH TREE CONKS: This sample of a 4 to 6 inch tree conk is designed for those who need a few Tree Conks for a specific design. Or for those who would like to see what a Tree Conk looks like before they order more. Tree conks have textured tops and smooth white bottoms. They grow on the sides of dead trees and can add a very woodsy look to your floral designs. They are packed dry and can be kept indefinitely if kept away from moisture.