You need a floor covering with tent greenhouses, or the grass will soon be higher than your plants!  Last year I used black weed barrier, but this year I had what I thought was the great idea to use tarps, which I would keep filled with water for extra humidity.

With every positive idea, there are always negatives.  The problem with the tarps full of water was that every time I went inside I got wet feet.  I could more easily live with that issue than the monster crop of mosquitoes that would hatch in these indoor ponds!  They would quickly eat you alive.  I finally had to put mosquito control into the water and periodically sweep the water out.