2nd Year Maturity. Growing Pacific Giant Series delphinium seeds this season is a classic and vibrant way to invigorate any stale flowerbed, walkway, or patio. Pacific Giant Series seeds mature into dazzling 48-60 inch tall delphiniums bursting with hardy blooming stalks perfect as a fresh cut substitution to more traditional larkspur or snapdragon. Pacific Giant Series delphiniums boast nearly 100% fully double blooms and are cultivated for their dense layering of color. Pacific Giant Series seeds promise some of the tallest and most robust of all delphiniums, drawing butterflies and important pollinators to the garden all season long.