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How long to keep heating mat on zinnas?

last month

This is my first time ever starting seeds inside. I got a heat mat and grow lights and Zinnas. Today I seen most of them sprouted. I know I should take off the lid but what about heating mat? I have my tray in the basement which is cooler down there so I'm worried if I take them off the heating mat they'll die. Should I leave it on longer? I'm not planning on planting for about 5 more weeks. Also I can't keep them upstairs because I have pets that will mess with them

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