Brown, slimy roots and wilting plants are often signs of root rot. In hydroponics it is usually caused by warm water with too little oxygen.
Signs to look for
Healthy roots are usually white or cream. Roots that are brown, soft or slimy, or that smell bad, need attention. Wilting even when the reservoir is full can also point to root trouble.
Causes
- Warm nutrient solution that holds less oxygen.
- Stagnant water with no aeration.
- Dead plant matter left in the reservoir.
What to do
- Add aeration, such as an air pump and air stone, where the system needs it.
- Keep the solution cooler by moving the reservoir out of direct sun or heat.
- Remove dead or rotten roots and leaves.
- Clean the reservoir and replace the solution.