Tunnel too damp!

Polytunnels, cold frames, greenhouses, propagators & more. How to get the best out of yours...

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Anyone got any ideas to dry out the tunnel a bit. With all the rain it is continuously damp inside where it seeps under the buried cover, luckily only on the outer edges for about 1' or slightly more. I still have to water the inner edges. I have green algae stuff on the soil & white fluffy mildew on the chillies that I was overwintering in there for next year, which had to go in the compost as it went into the stems & rotted them.

Now the automatic vent works and mostly the max temp in there is enough to open them for a bit, but the minimum temp just hoovers around 1 - 2C so I can't leave the door open as can't get down to close them with the erratic nature of work. I was wondering if I bought some of those little plastic room dehumidifiers with the grain cat litter looking stuff in them?

Any ideas as also rotting the last celery & the fennel?
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I wouldn’t bother westi one warm day and it will be bone dry, I only watered my pollytunnel about four times last year ,I would test the soil each morning it would be damp enough to keep every thing happy
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