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Root Rot in Yellow Flag
verifiedReviewed by the GreenScout Team
Yellow Flag is a vigorous, tall iris species bearing striking golden-yellow flowers with darker veining and sword-shaped leaves reaching 3–5 feet in height
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Yellow Flag care requirements
These care conditions are most relevant to root rot in Yellow Flag. Check each one as a potential cause.
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Water
Shallow water (2–6 inches/5–15 cm depth) or wet bog soil; tolerates dry soils but prefers consistent moisture; hardy in standing water
compost
Soil
Rich, organic-matter-dense soil or aquatic sediment; tolerates poor, clayey substrates; neutral to slightly acidic pH optimal
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Humidity
Requires high moisture; not suitable for drought conditions; thrives near water sources
symptoms
Symptoms to look for in Yellow Flag
- fiber_manual_recordBrown, mushy roots
- fiber_manual_recordYellowing leaves
- fiber_manual_recordWilting despite moist soil
- fiber_manual_recordFoul smell from soil
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Common causes in Yellow Flag
- fiber_manual_recordOverwatering
- fiber_manual_recordPoor drainage
- fiber_manual_recordFungal pathogens
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How to diagnose root rot in Yellow Flag
Remove plant from pot. Healthy roots are white/tan and firm. Rotted roots are brown/black and mushy.
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How to treat root rot in Yellow Flag
Trim all rotted roots with sterile scissors. Treat with hydrogen peroxide solution. Repot in fresh, well-draining soil.
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Preventing root rot in Yellow Flag
Always use pots with drainage holes. Allow soil to partially dry between waterings. Use well-draining compost.