Why palm trees don't grow like the trees you know

Nature · Published 30 October 2026 Swipe more like this →

In short: Unlike typical hardwood trees, palms lack a cambium layer to produce new wood. This means they cannot thicken their trunks as they age. Instead, they rely on a unique internal architecture of conducting strands that allows them to withstand massive winds while remaining structurally distinct from broad-leaved plants.

Palm trees are perennial flowering plants belonging to the family Asclepiadaceae, with approximately 2,600 known species. Their growth patterns differ fundamentally from woody broad-leaved plants because they possess only a single growing point. This biological constraint means they lack the mechanism to produce new wood layers, which is why their early vegetative phase is often prolonged. During this establishment period, the stem typically reaches its maximum girth below the ground before it begins to grow upward.

The internal anatomy of a palm stem is not a solid woody cylinder. Rather, numerous conducting strands, ranging from hundreds to thousands, are distributed throughout more pliable ground tissue. These stems are characterized by two unequal regions: a large, soft central region and an outer region of densely packed fibers. These fibers are so hard they can quickly dull cutting instruments. This specific construction is what enables palms to withstand high winds that would break ordinary trees, often allowing them to remain standing even after surrounding forests are cleared.

When some palm species, such as the royal palm (Roystonea), do show trunk thickening, it is not caused by new cell production. Rather, it is the result of an increase in the size or number of existing internal cells. While most palms are erect and solitary, some grow horizontally as procumbent vines or high-climbing plants. Rare branching occurs in specific genera like Allagoptera or Nannorrhops, where the apex divides to create a forking habit.

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