Zinnia Thumbelina Mix Zinnia Elegans. Thumbelina is an extra-low mixture and looks splendid in pots. The small double and semi-double flowers form an attractive carpet in your garden. Sow in a heated greenhouse (22-25?C). Prick out and later transplant or plant directly in a seedbed in the garden, allow to grow and then transplant to the final spot.Sluis Garden, quality seeds from Holland.