Vinca/Periwinkle Collapse: Phytophthora in Wet Conditions

Vinca (Catharanthus roseus) wilting with white soil specks after heavy rain in Central Florida—classic Phytophthora root/stem rot, nearly always fatal once symptomatic.

Diagnosis

• Vincas hate wet feet—extreme drought tolerance, zero flood tolerance
• White specks = fungal mycelium or pearl-like sclerotia
• Rapid wilt = vascular collapse from Phytophthora
• No cure once aboveground symptoms appear

Decision Protocol

• Improving + drying: Keep, monitor
• Worsening: REMOVE IMMEDIATELY—bag and trash, NO compost
• Soil: Phytophthora persists years. Solarize or replace soil before replanting
• Rotation: Plant non-hosts (ornamental grasses, salvias, lantana) for 2+ years

Prevention for Future

• Plant in raised beds/berms for drainage
• Space for air circulation
• Drip irrigation only
• Mulch to reduce splash
• Resistant varieties (Cora series) if available

Vincas are annuals in Florida—accept loss, learn drainage lesson, replant smarter next season.