Why is the trunk of a tree a cylinder?

Which kingdom does fern belong? Does Clinic Ace keep weeds under control around newly planted native hedges? Why are the leaves of my pineapple plant turning yellow? When do leaves change colors in North Georgia? How long does it take for grass seed to grow 3 inches? The plant disease recognized by the production of white or grey blooms on the lower surface of infected leaves is? What are dry stalks of cut corn called answer ends with aw? Will sod die if it freezes? Why do calla lilies not bloom you have had callas for a couple? How can a partially uprooted tree be saved? How can I effectively control the growth of vine-like weeds in my garden? When was Webster Rubber Company Plant created? What is the average height of a corn stalk in meters? Is poison oak spreadable by touch? Is crops a plural noun? How can I ensure successful growth when planting rhododendron in my garden? How can I effectively trim a rubber tree plant? What did people use to poison kings? What are the adaptations of the Daviesia Latifolia? Why are my dragon tree's leaves turning brown?