What kind of tree is green and covered in sharp, pointy spikes? - Quora

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What are those large trees with sharp spikes called, seen in the

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The redwood tree can reproduce by sprouting new growth from its roots and bark. Which (singular) name are fledgling trees known by? - Quora

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What kind of tree is green and covered in sharp, pointy spikes

Spiked Tree Trunk. Image & Photo (Free Trial)

What kind of tree is green and covered in sharp, pointy spikes

Is the cotton plant prickly anywhere on its exterior? - Quora