My Black Gamecock iris is lovely, but after two years, I'm getting the idea that I need something less 'assertive' in my 20 gal. bog filter. OR do I just need to accept that I have to hack (with a hand maul!) half or more of it out every spring to keep it from growing so much vigorous root system that it swells the pea gravel and causes an overflow? (Oops - I didn't divide it this spring, since it looked manageable, and then had to attack it yesterday to keep the filter flowing...) What bog plants wouldn't be so hearty but still provide good filtration? We're in zone 5a. In my next pond I'll use a bigger container for the filter, but with only a little pond, thought this was an adequate size - also, I suspect that the iris will spread to fill ANY container. Thanks for any info/advice!
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