I had catnip planted amongst the other herbs when we lived in Colorado. The catnip plants thrived. I had to hack them back a couple of times a year to keep them from taking over the yard. The cats would go out and graze after breakfast every morning...other times too.
I heard a rumor that Nermal was dealing. Must have been some good stuff. Even cats who typically didn't like catnip loved this homegrown stuff. You probably never saw any of the catnip harvest pictures. Nermal took his catnip VERY seriously!
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