There are over 2,600 varieties of palms, which include leafy house plants, landscaping trees, and even vines known as lianas. Although palms grow all over the world, most palms do not tolerate cold weather well and cannot thrive in freezing temperatures; they prefer hot and dry or tropical climates. Palms have evergreen leaves, called fronds, that grow atop a single stem; for palm trees, the stem becomes a trunk. Palm tree fronds can be used as food for some grazing animals or as straw for hats or furniture, and the wood from palm trunks can be used for durable hardwood flooring and siding.