Vinca (periwinkle) self-sows readily, but seedlings vary from the parent. For uniform color and habit, remove old plants after frost and replant fresh starts. If you value genetic diversity and don't mind variation, let seedlings grow.
White Substance on Gardenia: Mealybugs and Cold Hardiness
Aloe Plant Soil Mold & Leaning Arm: Beneficial Fungi, Check Roots
Red Yucca (Hesperaloe) Care and Seed Propagation
Blueberry in a Los Angeles Garden: Pot Culture for Acid Soil
Annual Vinca Seedling Care: Light, Water, and Fertilizer Balance
Growing Tomatoes from Store-Bought Fruit: Hybrid vs. Heirloom
Killing Thorny Pasture Weeds Without Harming Cattle or Grass
Plant Selection Advice Without Photos
Cactus Drought Stress Symptoms: Shrink, Yellow, Die Top-Down
Encouraging Blooms on a Mature Phalaenopsis Orchid
Understanding 4N Phalaenopsis: Tetraploid Traits and Value
Orchid Keikis: What They Are, When to Remove & How to Pot Successfully
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