Yes it is a heating pad but this one is plastic covered and waterproof so it can be placed under a tray of seeds and left for days or weeks until they germinate. Using bottom heat like this will really speed things up - that means it takes a few days instead of a week or more to sprout seeds. Cover seeds with clear plastic just to keep humidity in until seeds are up. Lettuce in 2 days- beets in 5!
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