Why do trees grow straight?

Gardening with Allen Wilson: Big trees not dangerous to children - The Columbian

Garrett: How can I make a crooked tree grow straight?

Growing Upward – A – Nature's Depths

Why Do Some Trees Grow in Spirals? - Save the Redwoods League

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Why do plant branches grow in straight lines, but you see twigs in

A grove of pine trees planted in a straight line so they grow straighter and taller as a result of direct competition for light. Photos

Advice to Grow By..Ask Us! - Merced Master Gardeners

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Five Common Pruning Mistakes, and How to Fix Them - FineGardening

Why do trees growing along the rivers lean toward it? - Quora

Why Trees Grow Straight

Garrett: How can I make a crooked tree grow straight?

Why do plants grow straight?

A grove of pine trees planted in a straight line so they grow