Cactus Characteristics, Habitat, and Human Uses

Cindy asked four broad questions about cacti.

Answers

1. Unique traits: water storage in pads/stems; spines (modified leaves) reduce water loss and shade tissue.
2. Best growth: where native conditions match (arid, well-drained, intense sun).
3. Human impact: food (prickly pear, dragon fruit), beauty, barrier hedges, oxygen, wildlife forage.
4. Why know growth: only necessary if you want to grow them successfully.

Chris (expert) apologized for delayed reply.