420: The Plant Episode

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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