Tall, slender shrubs that thrive in heat and sun

That’s a seriously limited range for a plant. An Italian Cypress might work, but those aren’t always the most reliable either. Everything in the spruce or juniper department will be tough.

Maybe a large trimmed up Slow grower but could be kept at a consistent height and width with proper care

Sky pencils are shite. No one should be using them here.

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That’s a seriously limited range for a plant.

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This

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Maybe a large trimmed up Slow grower but could be kept at a consistent height and width with proper care

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Maybe a Needlepoint Holly you pruned once a year to keep narrow.

Saguaro cactus