When should I remove the plastic cups?

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Already a very similar question a few question ago

Beginner question about lettuce; when it’s time to take off the plastic lids

Hello guys! I am a beginner and have received my smart garden several days ago. After few days, I see small sprout of lettuce and I wonder if I already should take off the plastic lids (caps) or keep them u til plants start to touch them? Many thanks guys!! [image]