Once income has been verified, use the following to determine qualifying quarters: If the year is: Credit 1 quarter for at least this amount. Credit 2 quarters for at least this amount. Credit 3 quarters for at least this amount. Credit 4 quarters for at least this amount.
Making the world better, one answer at a time. Periwinkles reproduce annually with internal fertilization of egg capsules that are then shed directly into the sea. The female periwinkle lay 10,000 to 100,000 eggs. Periwinkles reproduce annually with internal fertilization of egg capsules that are then shed directly into the sea. The female periwinkle lay 10,000 to 100,000 eggs.
How to Grow Vinca or Periwinkle Plants. Vinca or Periwinkle is a prolific heat and drought tolerant annual, perfect for hot, dry areas. It's easy to grow, and requires little or no attention. A grower once reported that he has grown Vinca in the same location for 30 years. It successfully reseeded itself each year, with no effort on his part.