Answer: The plant you describe sounds like Impatiens balsamina, also called Poor Man's Rhododendron or touch-me-not (because ripe seeds will shoot quite a distance from the plant). Balsams can be easily grown in evenly moist, organically rich, well-drained soils in full sun to half shade. The seeds can be sown directly in the garden and it will sprout in one to two weeks or they can be started indoors in small pots to stall full growth and make them more compact and for earlier blooms. The plants may self-seed in the garden. Most literature describes these plants as annuals but I have seen them grow to huge proportions in the Port Orchard and Silverdale areas so I expect the one you've seen at 6' is perfectly normal.
Best wishes with your new plant!
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