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My attempt to only bottom water in these trays has failed. Top down watering is always preferred, but it very difficult to do here. I had to take all the trays outside to water them. It isn't something I'll like repeating, but hopefully this weather will break next week. It was spitting snow today. It's been so gloomy and dark this past week that even the polytunnel never went above 55F during the "sunniest" part of the day.