I don't know yet but it will start with fleece off and likely finish with fleece on ...
Probably going to sow a few more seed trays, and check on progress. Yesterday I noticed some of my viola seedlings were starting to develop thier first true leaves.
The heated propagator I made seems to be working well with a soil temperature of around the low 20's. It's brilliant to look at in the morning and see how many new seedlings have come through over night.
I'm also looking forward to checking the temperatures inside and outside my greenhouse overnight I just want to get a feel for the amount of frost protection in my greenhouse.
I have a couple of silvercrest digital thermometers designed for cars they have an inside thermometer with the display and an outside probe on a couple of meters of wire. The outside probe is great for monitoring soil temperature. They also record maximum and minimum temperatures which can be reset automatically daily or reset manually. The reset is at midnight so i set the clock out by 12 hours and to cap it off there is a frost alarm.
Heat is an interesting subject I was told by a nurseryman to open the vents a little to help protect plants from frost and that works because moisture in the air condenses and that gives off latent heat which has a warming effect in the green house by venting the drier air in the greenhouse is replaced by moist air from outside which then repeats the cycle.