Dinnerplate Dahlias produce colorful blooms as big as dinnerplate. This decorative Dahlia is sure to impress! Each bloom will measure 8-10" in diameter.. This one is bright white highlighted with purple striations throughout. Official flower used for 14th Wedding Anniversary. Perennial only in Zones 8-10. For the large dinnerplate dahlias, we encourage you to pinch out the center growing tip right above the 3rd full sets of leaves. It will make the plant less top heavy to where you have a need for staking. Consider using a slug bait before its fully grown. Colors can vary in intensity due to soil, weather and humidity.