Diagnose and treat root rot in snake plants

Quick answer

Root rot is the biggest threat to snake plants, caused by overwatering and poor drainage. To diagnose, check if roots are dark brown, slimy, and smell swampy. To treat, remove the plant, trim all rotten roots, allow the cuts to callus for 24-48 hours, then repot in fresh, dry, well-draining soil and wait at least a week before watering lightly.

The idea

Snake plants are succulents that store water in their fleshy leaves, making them prone to root rot if overwatered. Root rot occurs when roots are deprived of oxygen in soggy soil, causing them to suffocate, turn brown and mushy, and lose their ability to transport nutrients and moisture.

To diagnose root rot, gently lift your snake plant from its pot. Healthy roots should be firm, plump, and either orange or white. If the roots are dark brown, slimy, and emit a swampy, rotting odor, your plant has root rot.

To save a plant with root rot:

1. Carefully remove the plant from its pot.
2. Gently wash all old, soggy soil away from the root ball under lukewarm running water.
3. Using sterilized pruning shears, cut off every piece of dark brown, slimy, or mushy root. Only healthy, firm roots should remain.
4. Place the trimmed plant on a dry paper towel for 24 to 48 hours. This allows the cut surfaces to callus over, sealing them against further bacterial infection.
5. Repot the plant in a fresh, dry cactus or succulent potting mix. Ensure the new pot has large drainage holes.
6. Wait at least one week before giving the plant a light watering.

Which plants this suits

This guide is specifically for snake plants (Sansevieria). The principles of avoiding overwatering and ensuring good drainage are also crucial for other succulents and drought-tolerant houseplants.

Why it works

Root rot is primarily caused by a lack of oxygen to the roots. When soil remains waterlogged, air pockets are eliminated, and roots cannot breathe. This leads to their decay and inability to absorb water and nutrients, effectively starving the plant. Removing the rotted parts allows the healthy roots to recover, and callusing the cuts prevents new infections. Repotting in fresh, well-draining soil ensures proper aeration and prevents future waterlogging.

Try it

1. Check your plant: If your snake plant's leaves are yellowing, soft, mushy at the base, or flopping over, suspect root rot.
2. Inspect the roots: Gently remove your plant from its pot. Observe the roots. Are they firm and white/orange, or dark brown, slimy, and foul-smelling?
3. Trim rotten roots: If you find rotten roots, use clean, sterilized shears to cut away all affected parts. Discard the rotten material.
4. Air dry: Place the plant on a dry paper towel in a well-ventilated area for 24 to 48 hours to allow the cuts to dry and heal.
5. Repot: Plant your snake plant in a new pot with excellent drainage, using a fresh, dry cactus or succulent potting mix.
6. Initial watering: Wait at least one week before giving the plant its first light watering after repotting.
7. Monitor: Over the next few weeks, watch for new growth or signs of recovery. Ensure the soil dries out completely between waterings.

Watch out for

• Fixed watering schedules: Never water on a set schedule like "every Sunday." Always check the soil moisture first.
• Poor drainage: Ensure your pot has adequate drainage holes and use a well-draining soil mix to prevent water from pooling.
• Overwatering: This is the primary cause of root rot. When in doubt, it's better to underwater than overwater a snake plant.
• Unsterilized tools: Always sterilize your pruning shears before cutting plant tissue to prevent spreading diseases.