Day: Nothing special. Also mushrooms can’t be planted during day but you unlock them next world.

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Night: Sun doesn’t fall any more, you have to rely on sun producers.

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Pool: Day: Has water you have to place lily pads on so you can’t plant plants there.

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Fog: Pool: Night: Pool but night and with fog you can clear out with a few plants.

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Roof: Day: Due to the shape of the roof you have to use catapult plants to get up. Also you have to place flower pots (and now water pots) on the roof to plant.

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Rain: Roof: Night: It is now night on the roof and it’s raining. The rain turns your flower pots into water pots and deactivates your fire plants unless you use umbrella leaf (or a new one maybe) to stop it. (Maybe I’ll add a new umbrella or something like that).

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Underwater: Day: It is now under your pool. You have to use certain plants so your plants Luke breathe down there. You can place all water plan there.