The recorded windchill temperatures at night have been in single digits all week. I haven't been able to see anything that's come up yet but I've been able to take a quick peek under the plastic to observe what the picture shows if you look hard enough-heat coming up from the ground. The sun has come out occasionally but I haven't put a thermometer under the plastic to know how warm it's gotten. Past experience has shown it to be 30+ degrees warmer then the outside air. I planted another square today of lettuce and radishes which means there should be eight squares growing soon-hopefully. I've got all cold crops planted under the tunnel so we'll see if this little experiment works. The towel under the tunnel(previous post picture)has been used to cover the squares that have been planted so far. It's just meant to provide another layer of protection-especially in this kind of weather.
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