54 degrees - Lettuce - Flood table - Greenhouse

[DoubleDogFarm]

The lettuce and pea shoots, in the greenhouse are just hanging in there. They received a pretty good hit of cold a few days ago. Hope to get a few more meals.

The flood and drain hybrid system is pretty smelly and the pea gravel is infiltrated with algae. Should I be concerned about the lettuce harvested?

The lettuce I broadcast in the gravel is doing almost as well as the potted plants.

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Eric

[Bobberman]

Got pretty cold at night. Are your water drums helping! Below 20 will be too cold.

[DoubleDogFarm]

Bobberman,

I removed the water storage sometime ago. It was taking up to much space and really did prove effective anyway.

Eric

[Bobberman]

Do you have any heat in there now.!

[DoubleDogFarm]

No supplemental heat. The permanent raised beds probably absorb a little heat during the day.

Now that the greenhouse is mostly empty, it's time to think subterranean. Collect heat at the ceiling and pump underground.

Eric

[Bobberman]

My barrel storage seems to work great but I have to have the double plastic or it won't work! The improvement I made this year is a pipe or two two foot above each barrel extending into the bottom and the metal pipe painted blace. It seems to warm the water a few degrees warmer expecially the barrels under the counters! I am going to have a small fan running blowing on the bottom of the barrels fom noon till 3 pm when the greenhouse is usually 60 or more!

[DoubleDogFarm]

I would use a thermostat on your fan, not a timer. Everyday between noon and 3:00 will not be the same. The fan will come on at a predetermined temperature. No need to blow cold air.

Eric

[Bobberman]

Ya I may go with the thermastat. I did buy one already. I also think the air circulation will keep the plants more healthy and less mold!