What are the rigs inside a tree trunk called?

When is the best time to plant vegetables on Kauai in Hawaii? How long does it take for blackberry bushes to produce fruit? Why is my rubber plant leaning and how can I help it regain its upright position? How can I effectively manage water runoff in my sloped yard to improve drainage? How often do you water your amaryllis plant? What causes moss to grow in your pastures? What are the functions of ovule? What are 2 reasons that tall trees don't grow on the tundra? How much water does eucalyptus require for optimal growth and health? Why is my cat palm turning yellow? When the flower of nicotia opens? Why did the tree fell over? What weather do lemurs live in? Why are the leaves on my orchid turning brown? What year did Fern Y. Hunt die? How can I ripen spaghetti squash quickly and effectively? What is the difference between mold and mold? How do you trim a spathe plant? How can you determine when eggplant is ripe to pick? How can I prevent rollie pollies from eating my garden?