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using grass is good, full of nitrogen so they'll be getting a good feed out of it as well. didn't think of using boxes, I'm guessing you would use it as a mulch? cut holes in so the plants stick out from the top?

No, I just cover the plants overnight with boxes to prevent the plants freezing

oh, I get you now, sorry I miss understud. bet you cant wait for the warmer weather to come. :D

Indeed!