Studio Home's Julia Atkinson-Dunn knows a thing or two about flowers. Here's how to grow and arrange her favourite blooms like floral-pro. 1. Dahlias When I was fresh to flower gardening, dahlias were a kind of rite of passage. After I had played around with fun annuals, then dipped a toe in uncomplicated perennials, dahlias not only demanded a little more attention in their preparation and care, but rewarded me with the most impressive blooms.