What is the class of tulips?

What is the practice of growing two or more crops in the same field in a given year? What can you do to make your grass healthy? How do ferns transport water? Do maple trees like alkaline or acidic soil? What is the maximum age of a banyan tree? The roman goddess Flora was in charge of what? How can I save a dying evergreen tree? Does the spruce tree keep leaves all winter long? How can I effectively grow a new lawn in my yard? What is French for the name Mark? How do you care for king protea is it an outdoor plant or is it tropical? Which side of a tree does moss grow and why? Does cows like rosemary's? Where is iris from? Why do the leaves produce more anthocyanins in the fall? What type of crop is hemp? Will grass seed be killed from freezing when you are seeding? What colors make lilac? What are drought tolerant seeds? Why is my Maranta plant drooping?