For a while now, I’ve been talking about our issues with the new portable greenhouse. It gets nice and warm during the day, which would be ideal for our seedling trays, but the temperatures drop right down during the night. Yesterday, for example, the outside temperature reached 17C/63F, and the thermometer in the greenhouse, which “only” goes to 50C/155F, was off the scale. Likely warmer than 60C/140F (my thermometer that is marked up to 60C is currently being used to monitor the covered bed in the old kitchen garden).
Last night, we dropped to 0C/32F. While I was doing my morning rounds, it was about 1C/34F. By the time I got to tending the greenhouse, that’s what thermometer was reading in there. The basement may be cold, but it doesn’t drop below 10C/50F during the night. It doesn’t go above 12C/54F unless we have the heater going, but at least things are not at risk of freezing.
Today, I rummaged around and dug out a black garbage can that was being used to store some odds and sots. I set it up in the greenhouse, got a garden hose hooked up and one of my daughters was kind enough to turn on the shut off valve in the basement for me, so I could fill the garbage can.
Thankfully, the garbage can doesn’t seem to have any cracks or leaks anywhere. It’s been outdoors for many years, even before we moved out here.
There is no lid, so I had to figure out what to use to cover it, just in case a critter got into the greenhouse. At first, I was going to make do with an indoor/outdoor floor mat, but then I spotted a piece of rigid insulation that looked large enough. That worked out much better.
While there is no wind in there to blow it off, I still put a weight on it, just in case. Granted, if a critter does get in and jumps up there, it would probably still knock it off, but it is more likely to be scared away, than fall in.
The water in the black plastic bin will heat up during the day, creating a heat sink that will slowly release that heat during the night. Once we do finally have trays in there, it will serve a dual purpose. There will be warm water that can be used to water the plants.
Going in and out of the greenhouse and standing there while monitoring the water level was enough to increase the temperature by almost 2 degrees before I was done. If that’s all it takes to start warming things up, the heat sink should work quite well.
It should be interesting to see what the thermometer says in the morning. Our overnight low is supposed to be 0C/32F again, but we’re supposed to get a mix of rain and snow in the wee hours. Tomorrow night we’re supposed to drop to -2C/28F, then have lows above freezing until Friday, when we’re supposed to drop to -4C/25F overnight.
Today’s high is supposed to be only 6C/43F with overcast skies. We definitely won’t be hitting 50C/122F or higher in there, today! However, we should still get temperatures of at least 20C/68, which should start getting that water warmed up nicely.
We shall see how the experiment goes!
The Re-Farmer
The Re-Farmer 