That's awesome, and those trees are rather large for the pots they are in.That is a beautiful space with lots of potential. Here is one option:
I will definitely be using something once they start needing water.Just a little thought @ktrain I was thinking about what TJ was saying about humidity and a dehumidifier. It occurs to me that you might want to lay down pond liner where you're working. It's not that expensive to protect that floor. If you're really only going to go with a couple of tables and then not continue to use that gorgeous room as a grow room then you're cool. But it doesn't take much to screw up that wood, and a pond liner is a great insurance policy.
Well once the weather begins to warm a bit, I swear I will finally get out and finish my green house.LOL I had to learn about pond liners the hard way after causing damage to some beautiful wood floors.