Question: I once saw a sci-fi movie set in space. There was a huge spaceship with a plant nursery aboard, and there were robots manning it and looking after the plants. I remember one little robot watering plants with an ordinary watering can, but other than that the memory is a bit sketchy! — Ben

Flickchick: This sounds like Silent Running (1972), which I remember as one of the only movies that ever put me to sleep. But that was a long time ago.