Preventing Yellowing in Annual Vinca (Catharanthus) Seedlings

Annual vinca seedlings turn yellow mainly from overwatering or excessive fertilizer. Correct culture:

Light: 14 hours/day; lights 3 inches above plants.
Water: Bottom-water; let surface dry between waterings. Never saturate.
Fertilizer: Half-strength balanced feed every 10 days; mist with dilute solution twice weekly.

Vinca is sensitive to wet feet and high salts. Good drainage and restraint are essential.

Seeding and Propagation: Endothall Herbicide Safety for Dogs: What Pet Owners Need to Know; High-pH Irrigation Water (8.2) Killing Vegetables? Solutions: Filtration, Rainwater Harvesting, and Soil Management; Improving Clay Soil Drainage for a Healthy Lawn in Texas; Annual Vinca Seedling Care: Light, Water, and Fertilizer Balance; Plants Around a Chlorinated Pool: Salt Is the Real Enemy; Rescuing a Tiny Phalaenopsis Keiki Without Roots; Ideal pH for Hardy Water Lilies; High pH (8.4) in a 7,000-Gallon Koi Pond: Lowering It Safely; Annual Vinca (Periwinkle): Varieties and Growing Guide; Catharanthus (Annual Vinca) Disease Control: Botrytis and Phytophthora Management

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