Experimental container garden - critique needed
Thinking ahead to next winter....
I'm a high school science teacher and one of my pet projects is my experimental design class. This year, we experimented on the growing conditions of avocado plants in the school's greenhouse and got some cool results, but we used a grant to cover the cost of propane to heat the greenhouse. Now, having used up that grant, I'm trying to come up with alternatives for heating projects next year since the agriculture department doesn't use the greenhouse for anything during those coldest months of the year. We will not be able to heat the greenhouse this coming year, so this is one of my ideas.... tell me why it won't work or give me any other kind of feedback you'd like!
First, we have three 2x4'x8" boxes used as planters from this year that we can reuse. I would like to set up a circulating pump to move heated water underneath the soil and then cover the bed either with low hoops or something similar to hold in heat.