105-112 days. Diana Series Mix dianthus seeds deliver huge explosions of pink, burgundy, fuchsia, velvet, magenta, and white on such a dwarfed plant. Diana Series Mix matures to just 8 inch tall yet still boasts enormous 3 inch feathered dianthus blooms. Diana Series Mix dianthus is easy to grow from seed, heat tolerant, and a seasonal favorite to hummingbirds, butterflies, and other important pollinators. Diana Series Mix dianthus seeds are the perfect grow to drape from hanging baskets, planters, and window boxes. Pelleted Seeds.