Moondew Nectar is one of the hardest resources to gather in Slime Rancher 2 since it requires you to unlock two separate upgrades, and only spawns in a particular area at a certain time of day. That said, it's pretty valuable since it's the favourite food of the Flutter Slimes, and can be used to get rid of the Flutter Gordo Slime...
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Where to find Moondew Nectar in Slime Rancher 2
Source: PC Gamer (opens in a new tab)