They'll get to 24". This mix has flowers that bloom a long time. They are excellent as cut flowers and grow to 3 inches in diameter. Produces very well where Summers are cool. A collection of pastels in various shades of reds, pinks, purples and whites. For earliest blooms, plant seeds 8 weeks before last expected frost. Sow in sterile potting soil 1/8 in deep. Germination 1-2 weeks. Transplant to individual pots when the first true leaves appear. Put into garden after danger of frost has past. 90-110 days. Annual.