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passive cooling idea for row cover low tunnels

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Starting brassica seedlings for fall harvest here is REALLY difficult. The weather in July and August is just too hot, and getting worse.

I start seedlings under row cover low tunnels built of PVC hoops and rebar ground stakes. They are fairly strong and could take a lot of weight.

If I set up a system to trickle water very slowly down the north side of the fabric, would I get significant evaporative cooling inside? Keep in mind that this is Denver, CO with low humidity, lots of wind, and high temperatures, an ideal drying climate.

I'm thinking of either a soaker or drip type hose connected to a garden hose, or a leaky gutter that could be refilled every day.
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I would do a propagation mister timer, like in the grocery store veggie aisle.  On for a few seconds every few minutes.  You can find controllers to run an irrigation valve, but it is probably easier to find one to run a pump and just pump from a rain barrel.
But why do you have six abraham lincolns? Is this tiny ad a clone too?
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