Chenery where is hte coop , thanks
The salt method works very well, that is all the city ahd ODOT do to control the medians arounds the highways.
Rock Salt / Road Salt would be very effective and last a long time. I have to second all the concerns with erosion though. If it starts eroding, you'll likely wish you had just mowed it now and then.
Most municipalities have a rule where they have to notify you before they can mow it for you and charge you. So I'd just ignore it and only mow(brushHog) when you get a notice.
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