Campanula Seeds - Clips Series - White2nd Year Maturity. Clips Series White seeds grow year round campanulas in your home or garden for perennial perfumes. Often planted as annuals, campanula seeds are perennials that grow to be cool hardy and thrive in a wide range of temperate North American climates. Clips Series White campanula seeds grow compact, yet durable 8 10 tall mounds of alpine white ideal for indoors, hanging baskets, or as a potted gift. 1000 seeds. Growing Clips Series