White Flower Farm Dahlia Otto's Thrill

These are true dinner plate dahlias, producing massive, show-stopping flowers that can reach up to 10 inches in diameter.

Yes, given their height of 36 to 48 inches and the weight of those massive blooms, you should provide support like a stake or cage to keep the stems upright and prevent them from snapping in the wind.

Absolutely. Because of their size, choose a large, sturdy pot—at least 12 to 16 inches in diameter—with excellent drainage to accommodate their root system and provide enough stability for the tall stems.

If you are outside of USDA zones 8-10, you will need to treat these as annuals or lift the tubers. After the first frost kills the foliage, carefully dig up the tubers, let them dry, and store them in a cool, frost-free location like a basement or garage until spring.

For the best bloom production, they prefer full sun, meaning at least 6 to 8 hours of direct sunlight daily. While they can tolerate partial shade, you will likely see fewer flowers and weaker stems.