- You Will Get 100+ Seeds of Under The Sea Zinnia Elegans Annual Mixed Flower Seeds. - Under The Sea Zinnia Flower Seeds. - 100+ Seeds. - Days To Maturity: 80. - Plant Height: 2-4'. - Planting Depth: 1/4-1/2". - Plant Spacing: 15-18". - Spread: 10-15". - Plant In Sun. - Life Cycle: Annual.