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Yes they do have a bottom! We built the flats last year. Here's a link with instructions if you're interested: https://steemit.com/homesteading/@sagescrub/how-to-wooden-flats-for-seed-propagation

Good luck with your squash and cucs!!

Thanks so much for digging that link out its a fab post, totally keeping that in mind for when i have some more spare wood! 😊

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