Answer: Generally, roots spread about 1.5 times as far as the drip line (edge of the tree/shrub's crown), so any dwarf variety of trees and shrubs that have a crown spread of about 3 feet should be a safe bet. But with such an investment (pool and landscape plants) I believe it's worth spending the money on professional consultation. That way you will be sure that the chosen plants will fit your needs, and you won't risk damage to your pool. Sorry I can't be more specific, but I really think this warrants care...I wouldn't want my suggestions to put your pool at risk!
Brugmansia is a large tropical herbaceous perennial that you can grow in containers and overwinter, or grow as an annual. The plant has huge, fragrant, trumpet-shaped flowers, and is available in several colors. Most varieties of canna also grow to 3-4 feet tall, and their foliage and flowers lend a hot, tropical air to a setting. You can lift the bulbs each fall and replant them in spring.
Good luck with your pool landscape!
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