You can never have too many tomatoes and from the look of things you're going to have a bunch. I like the idea of placing them next the heat wall. The wall looks like it is made from concrete blocks. I would imagine the blocks absorb the heat during the day and let off the heat as the nighttime temps drop. Pretty hot idea. 😁
One is never to old to learn a few new tricks and up until last year I was also keeping the light source too far from the plants. This year I have the light almost on top of the new seedlings and it has really made a difference.
Happy gardening my friend.Some great advice from @goldenoakfarm about keeping the light source 2" from the plant to keep it from stretching out.
Yeah, I had not thought too much about the distance of the light from the plants, it does make sense.
The heat wall is made from dry stacked concrete blocks. I painted the sun facing side to absorb more heat during the day. Once summer gets here, I cover up the wall with something to keep it from absorbing too much heat. It gets hot in there when the sun is shining. I have to leave both doors open all summer. I really should set up a roof vent to help control the heat in the summer.
Since heat rises, a roof vent may work out great. Besides letting the heat out through the roof, you may be able to close the doors to the greenhouse which may help to control any pests that may enter through the open doors.
I like laying the block dry, it allows you to change the arrangement if need be, plus it's a lot less w--k.