The Science of The Expanse: Season 1, Episode 5

Holden is super-excited about the Tachi's coffee machine ... so much that he doesn't even notice that interesting botanical arrangement on the wall.

Let's assume that this display contains real plants and not fake ones (it's way more fun this way). It is common knowledge that plants grow towards their light source, so if the light in the middle of the display were a grow lamp of sorts this would be possible, and the orientation of the plants would be correct. But what about the whole 0g aspect of it all? Gravity is an important influence on root growth, but scientists have found that space plants don't need it to flourish. A research team from the University of Florida in Gainesville thinks this ability is related to a plant's inherent ability to orient itself as it grows. Seeds that germinated on the International Space Station sprouted roots that behaved like they would on Earth—growing away from the seed to seek nutrients and water in exactly the same pattern observed with gravity.