High-Iron Well Water and Plant Failures: Iron Toxicity vs. Pythium Root Rot in Neutral pH Soil

Sand-point well water high in iron (stains cement, siding). Recent perennials died (bee balm, gaillardia, heather). Poppy and sunflower seeds didn't germinate. Established plants vigorous. Asks if iron oxide toxic to young plants/seeds.

Possible Iron Toxicity

Shows as brown edges on mature leaves, new leaves brown completely. Species vary. If well only for irrigation, add pool sand filter.

Disease Also Possible

Root rots attack certain plants. Send soil sample to university/lab. Talk to local gardeners.

Follow-Up: pH 7.0 in Four Areas

Acid-lovers thriving at pH 7 suggests they like iron but pH not lowered. Suspect Pythium root rot. Treat with Agri-Fos (Monterey) for Pythium/Phytophthora. Rule out disease before blaming iron.