Summary: When Monstera is submerged, it triggers its innate ability to restrict water loss. The plant’s leaves curl inwards to diminish the surface area and prevent expelling too much water vapor into the atmosphere through transpiration.
There are a few reasons why Monstera leaves might point up. The most common reason is that the plant is seeking more light. Monstera leaves will naturally grow towards the light, so if your plant is not getting enough light, the leaves will point up in search of it. Another reason might be that the plant is overwatered. If the roots are sitting in water for too long, they will start to rot, which can cause the leaves to droop. Finally, the plant might be under stress from too much heat or cold. If the leaves are pointing up and the plant is not getting enough light, try moving it to a brighter spot. If the plant is overwatered, let the soil dry out completely before watering again. If the plant is under stress from the weather, try moving it to a more protected spot.