Understanding and Managing Leafless Runners

Leafless runner (seen above my fingers) on Monstera lechleriana

Have you ever noticed long, leafless vines on your houseplants? These are known commonly as "leafless runners." These are part of the stem of the plant where a node is located but does not grow a leaf. Plants like Monstera karstenianum, Monstera adansonii, Monstera obliqua, and Amydrium are known to produce these runners.

Why Do They Occur?

Leafless runners often develop when a plant is under stress, such as from low light conditions, physical damage, or frequent pruning. In response, the plant diverts energy to produce these runners in an attempt to propagate itself. However, these runners lack leaves, which means they cannot photosynthesize and contribute to the plant's energy needs.

How to Prevent Them

To minimize the occurrence of leafless runners:

• Provide Adequate Light: Ensure your plant receives bright, indirect light to promote healthy growth.

• Avoid Over-Pruning: Excessive cutting can stress the plant and trigger runner formation.

• Maintain Plant Health: Regularly check for pests and diseases, and provide appropriate water and nutrients.

Propagating Leafless Runners as "Wet Sticks"

Despite lacking leaves, these runners can be propagated:

1. Identify a Node: Look for a small bump or ring on the runner; this is the node where roots and new growth can emerge.

2. Prepare the Cutting: Cut a section of the runner that includes at least one node.

3. Use Sphagnum Moss: Place the cutting on moist sphagnum moss, ensuring the node is in contact with the moss.

4. Create a Humid Environment: Cover the setup with a clear plastic bag or container to maintain humidity.

5. Provide Indirect Light: Place the setup in a warm area with bright, indirect light.

6. Wait for Growth: Be patient; it may take several weeks to months for new roots and shoots to develop.

Once new growth appears and roots are established, you can transplant the cutting into soil to continue its development.

By understanding and managing leafless runners, you can maintain the health of your houseplants and even propagate new ones!