From the Super Mario Wiki
Steam Gardeners are a variety of robots found in Steam Gardens of the Wooded Kingdom in Super Mario Odyssey. They are the autonomous gardeners of Steam Gardens, shaped like yellow watering cans. They serve mainly to water the flowers, but also to maintain the rest of the greenhouse and give Mario advice.
At the game's finale, in the Moon Kingdom, a few Steam Gardeners can be found in attendance of the wedding between Bowser and Princess Peach. Like other attending members, they were brought forcefully. After beating the game, they can be found at the entrance of the Moon Kingdom near the Odyssey, close to the Crazy Cap store in Bowser's Kingdom, and in the start of Darker Side.
Like many of the supporting characters, Steam Gardeners will cower and refuse to talk to Mario if an enemy gets too close to them, regardless whether Mario has captured the enemy in question or not.
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