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would any of you know approximately how much spearmint I could get per plant? I am looking to buy a four tier greenhouse and fill it up completely with spearmint so I am not exactly sure how much the yield would be.

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    Why are you proposing to grow a hardy perennial field plant in a greenhouse? What is your end product you want to know the yield of - leaves (green or dry?), oil? I can't imagine that "4 tiers" will work out well for 3 of them, as the top layer will block most of the light. to any below.
    – Ecnerwal
    Aug 14 '15 at 22:53
  • Mint really doesn't grow well in pots anyway, assuming that's what you're planning
    – Bamboo
    Aug 15 '15 at 13:42
  • I put my mint in a pot in the ground this year to keep the roots from spreading too much.Seems to have worked well; but I'm still pulling mint out of the bed it used to be in. It is mostly a weed that doesn't require much care and feeding; and it will grow as big as you allow it. I have cut mine one plant, propagated from one stem that survived last winter, back several times so it would not shadow other plants, and i still have plenty left to make jalapeno mint jelly when the peppers ripen.
    – sborsher
    Aug 17 '15 at 20:23