This Stunning Mix Of Grandiflora Frilled Petunias In Glorious Shades Of Blue Is Perfect For Growing In Hanging Baskets And Containers. Particularly Tolerant Of Rain This Mix Flowers From Many Months Offering Fuss free Exuberant Displays.here’s How To Sow Seeds For Successful Germination…..1 Fill A 6 9cm Pot Or Cell Tray With Seed Compost – Which Is Light And Contains A Small But Balance Level Of Nutrients In The Soil. Overfill The Pot Or Cell Trays And Strike Excess Soil Off So That The Seed Tray Is Filled To The Top With Un compressed Soil.2 Water Soil From Underneath By Placing The Tray In A Container Of Water