The so-called Pompon Dahlias are lush plants that produce masses of ball-shaped blooms. Wizard of Oz Pompon Dahlia is no exception. It’s 8cm (3″) wide blooms are nearly spherical and appear all at once over a long period from mid- to late summer. Plant in full sun in containers or raised beds, or just scattered in the mixed flower border. These are wonderful, long lasting cut flowers. One tuber per package.