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I heard if you don’t pinch them off then the plant slowly dies - is that true?
Oh dear, I just thought that they'd get leggy like basil, maybe I should pinch the flowers off...
I’ve heard this as well
Just take a cutting before letting it bloom. They make roots super quickly in water.
That being said, I have no idea if they die off after blooming. According to Wikipedia they are perennials though.