We've had a cold and wet spring here so far. Even the cool season veggies are having a slow go at things.
To warm up baby plants I've kept a sheet of greenhouse plastic over my starts to keep them warm. Normally I would've swapped to a mesh one by now, it lets air and heat get out but keeps the squirrels from "transplanting" their own seeds.
This year I have a lot more confidence with this because I bought a thermometer to put in the DIY greenhouse. It keeps track of three temperatures (current, high since midnight, low since midnight) so it's easy to know when remove the plastic for a few hours or even swap for the mesh.
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