Xylem
The water-conducting tissue in plants that transports moisture from roots upward through stems and leaves, essential for survival during droughts.
Specialized plant tissue that transports water and dissolved minerals from the roots upward through the stem and branches to leaves and other parts. It consists of hollow, tube-like cells stacked end-to-end and is a key component of wood in trees. Under drought stress, failure of water transport through this tissue can lead to tree death.
What this means in real life
When a tree faces severe drought, water cannot move efficiently through its wood to reach the leaves, causing them to wilt and die—similar to how a plant dies if you forget to water it for weeks.
What it isn’t
It is not the same as phloem, which is a separate plant tissue that transports sugars downward from leaves. Many people confuse the two because both are vascular tissues, but they serve opposite functions.
Commonly misused online
Social media often uses 'xylem' as shorthand for 'tree health' or 'plant survival,' when it actually refers only to the water-transport mechanism—trees can have healthy xylem but still die from pests or fire.
Based on 2 reference sources, including primary sources. Last verified July 16, 2026.