Lack of Support
For any monstera parent, it’s important to understand how these plants grow in the wild. They root in the soil and naturally climb upwards on tree trunks, occasionally putting out aerial roots for support. When grown as a houseplant, it’s up to you to give your plant the support it needs. Without support, as your plant grows, it will naturally fall over. Plan to stake your plant using a moss pole or trellis. You might need to add ties to get it started, but soon it will naturally begin to adapt to its support structure.
Lack of Sunlight
A monstera plant grows towards the sunlight. So if your monstera only receives sunlight from one direction, then it might begin to grow towards the light. This can cause it to look like it is falling over and very lopsided. If this is the case for you, try to rotate the plant on a regular basis. This way, all of the leaves are getting sunlight, and the plant will grow in a more balanced way.
If possible, move it to a room that has sunlight coming from multiple directions. However, if the monstera’s home is in a smaller room or apartment with limited options, the rotation method will work!
If your monstera plant receives plenty of sunlight from different angles, or you are a regular rotator, then it might be falling over due to potting issues. If there’s not enough soil to support the root ball, the plant could become top-heavy, causing it to tip to one side. To avoid this, repot your plant as needed to ensure there is plenty of soil surrounding the roots. With a well-anchored base, the stems can begin to grow upwards again.