Well, in the future, you might be able to give your plants implants that let them tell you what they need.
A researcher accidentally discovered that carbon nanotube sensors he was working on can detect the chemicals plants give off when "stressed" (Does this mean plants feel pain?)
Obviously this is going to be mostly used in labs and then in agriculture, but I can imagine a future when your houseplant informs you via an app on your phone or a smart speaker that it would really like some water now, please.
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