: They typically sprout within 7 to 14 days if kept at a warm temperature between 65–70°F.
: Known for specific, high-quality series like the "Tattoo" and "Titan" vinca, which feature unique colors like Tattoo Papaya or Blueberry . buy periwinkle seeds
: Unlike many seeds, periwinkle seeds require total darkness to germinate. Cover them with roughly 1/4 inch of soil. : They typically sprout within 7 to 14