420: The Plant Episode
Update: 2025-08-20
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Does John want to be a corn or pea plant? If we were able to put enough plants on Mars, could they produce enough oxygen for us to be able to breathe? Is there a scientific definition of what constitutes a weed? How do purple leaves work? Should I tell my friend she’s been watering a fake plant for seven months? …Hank and John Green have answers!
If you're in need of dubious advice, email us at hankandjohn@gmail.com.
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