Aerial root.
A root that develops above the growing medium rather than entirely inside it.
What it means for your plants
Aerial roots may help a climbing plant attach to a support or explore moisture. They are normal growth, not automatically a sign that the plant needs a bigger pot. Avoid forcefully bending stiff roots.
IN PRACTICE
A mature monstera can produce long aerial roots from its stem even when its underground root system has enough room.
Put it into practice
Help your monstera grow with suitable light, an airy potting mix, thoughtful watering, and support for its climbing habit.
Monstera deliciosa care: light, watering, and room to climb