Reddit mentions of Miracle-Gro Moisture Control Potting Mix, 2 cu. ft.

That's a pretty neat.

Do you currently have a terrarium, and if so, how much light does it get? My only concern is that type of grass probably likes full sun, so it may need to be by a bright window and/or supplemental lighting to be happy. This can easily roast plants however (especially in smaller closed containers), so make sure it is ventilated or doesn't get too hot.


If you want to know specifically how to set up a terrarium, its pretty easy.

1. In the bottom of a clean tank or container, put an inch or two of small stones/pebbles/coarse gravel for drainage.
   
   
2. Put a layer of horticultural charcoal on next to help with odors and mold.
   
   
3. Add a layer of potting soil (you cant go wrong with the miracle-gro stuff) and put your sod and any other plants in. If your sod is root bound at all, massage it a little to gently pull the roots apart before planting it. Make sure you regularly water your newly transplanted plants, but don't over-water or let too much water build up in the tank.
   
   You don't need any fertilizer, and I like using a dose of Superthrive if it looks like my plants are struggling.
   
   You could also grow the sod in a container within a larger terrarium if you only have a little bit. If you want a baseball theme, you have plenty of creative options (like using a cubs helmet as a container, etc.).