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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Looking at pencil point juniper.

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That would be my suggestion, the spiral or pencil, but their bush gets really out of hand if you dont prune regularly.

Giggity...