One of the most common mistakes in indoor plant care is overwatering. Not because people don't know better — but because the fear of letting a plant dry out pushes them to water too often. The result: roots sitting in water, suffocating, and beginning to rot.
I experienced this personally with my African violets. And I managed to save them without repotting.
What Root Rot Looks Like — The Signs I Noticed
With violets, the first sign wasn't in the soil — it was in the leaves. Some leaves became soft, watery, limp — not dry, but bloated and lifeless. Not all plants, just a few.
This is the classic sign of damaged roots: the plant can no longer transport water efficiently even though the soil is wet. Rotted roots don't function — and the leaves show it first.
Other common signs of root rot:
- Yellow or brown leaves at the base that fall off easily
- Soil that stays wet for a long time even without watering
- A faint fermentation smell from the pot
- Plant wilting despite wet soil
- Black, dark brown, or mushy roots if you remove the plant
What I Used — Previcur Energy (Bayer)
Previcur Energy is a systemic fungicide by Bayer with two active substances: propamocarb and fosetyl-aluminium. It acts through both roots and foliage — exactly what's needed when the problem is in the soil.
Effective against:
- Pythium sp. — the most common cause of root rot in indoor plants
- Phytophthora sp. — less common indoors but possible
- Damping-off — relevant if you propagate from seeds or cuttings
How I used it:
- 1 ml per 1 litre of water
- Watered directly at the base of the plant, under the leaves
- Repeated twice, 7–10 days apart
- I didn't repot — I wanted to try treatment first
The result: soft leaves stabilised, the plant stopped declining. The most severely affected leaves didn't fully recover, but the rest of the collection survived.
Why African Violets Are Prone to Root Rot
African violets (Saintpaulia) are among the most sensitive plants to incorrect watering:
- They need small pots — roots fill the space, water doesn't stagnate
- They prefer bottom watering — through the saucer, not directly on leaves or into the centre of the rosette
- Soil should partially dry between waterings — not completely, but never permanently wet
- Water temperature matters — cold water on leaves or roots stresses them
If you water frequently and the pot is too large, excess water remains in the soil, oxygen disappears, and Pythium finds perfect conditions.
Previcur at Repotting — Preventive Use
Beyond treatment, I also use Previcur Energy preventively at every repotting:
- First watering after transplant: water + 1 ml Previcur per litre
- Protects new, vulnerable roots from fungal infections
- Especially useful when using new substrate or pots that haven't been disinfected
This practice comes from professional horticulture — in greenhouses, every transplant is accompanied by preventive fungicide treatment. There's no reason not to do the same at home.
When You Do Need to Repot
Previcur can save a plant in early stages. But there are situations where treatment alone isn't enough:
- Roots are more than 50% rotted — the plant has no reserves to recover
- Strong smell of rot from the pot
- The stem or crown is soft or black
- The plant collapses completely and doesn't respond after the first application
In these cases: remove the plant, cut all black and mushy roots with disinfected scissors, let dry for 30 minutes, repot in fresh substrate, and water with Previcur solution.
Conclusion
Root rot doesn't automatically mean the end of a plant — if you catch it in time. The key sign: soft, watery leaves with wet soil. The treatment: Previcur Energy 1ml/l, two applications 7 days apart.
Previcur is available on eMAG and in agricultural supply shops in Romania.
If you're not sure what's wrong with your plant or whether urgent repotting is needed, book a consultation — I'll tell you exactly what to do.
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