Why Your Impatiens Keep Getting Root Rot — And How to Fix It

You've grown impatiens successfully for over a decade on the north side of your home. But for the past three years, root rot has struck every season — even after you mounded the soil for drainage and replaced it entirely. The plants look great for about four weeks in spring, then the rotting begins. What's going on?

The Real Culprit: Watering Habits, Not Soil

Root rot in impatiens almost always stems from one issue: the crown of the plant — where stems meet soil — stays constantly wet. This happens with frequent, shallow watering: hand-watering daily, evening watering, or an automatic sprinkler system that runs too often.

Impatiens may wilt in afternoon heat but recover by evening. But if you water shallowly in response, the soil around the base never dries out, creating perfect conditions for fungal rot.

How to Water Impatiens Correctly

• Water deeply, not daily. In hot weather (85°F+), water deeply every 4 days. In cooler weather, every 5–6 days.
• Always water in the morning. This lets foliage and soil surface dry before nightfall.
• Let the top inch of soil dry between waterings. Check with your finger — if it's moist, wait.

A Biological Boost: Serenade (Bacillus subtilis)

Spray stems and soil with Serenade, a beneficial bacteria that outcompetes harmful fungi. Apply in the morning so foliage dries quickly. Combine this with corrected watering for best results.

With deeper, less frequent morning watering and a biological spray, your impatiens should thrive again — just like they did for your first ten years.