The "AA" sized dahlias are the true giants of the dahlia world. Blooms can easily reach 11-12 inches. "A" size dahlias average 9-10 inches. These giants require staking to support the massive blooms. Plant height varies from 3' to 6' within this category. Bloom size and plant height are not necessarily linked. Click images to enlarge. Aitara Majesty AA Semi-Cactus Yellow $ 8.75 Alfred C AA Semi-Cactus Orange $ 7.25 Amhurst Regina A Semi-Cactus Yellow $ 9.00 Andriana A Laciniated White $ 6.75 Ayers White Knight AA Semi-Cactus White $ 9.00 Barbara B AA Informal Decorative Dark Pink $ 7.75 Bodacious AA Informal Decorative Red $ 7.25 Clara Huston AA Incurved Cactus Orange $ 7.75 Clyde's Choice AA Formal Decorative Orange $ 7.50 Creve Coeur AA Semi-Cactus Red $ 8.00 Cynthia Huston A Semi-Cactus Red $ 8.00 Cyril Higgo A Laciniated Red $ 8.75 Dixie's Winedot A Informal Decorative Variegated Yellow and Red $ 8.25 Drummer Boy A Formal Decorative Dark Red $ 8.00 Elsie Huston A Informal Decorative Pink $ 8.00 Emory Paul AA Informal Decorative Purple $ 9.00 Formby Kaitlin A Formal Decorative Purple $ 9.00 Hollyhill Electra A Incurved Cactus Orange $ 8.00 Inland Dynasty AA Semi-Cactus Yellow $ 9.50 Islander A Informal Decorative Dark Pink $ 8.75 Ivory Palaces AA Informal Decorative Yellow $ 8.25 Kenora Wildfire A Semi-Cactus Red $ 7.75 Kidd's Climax A Formal Decorative Light Blend Yellow & Pink $ 7.00 Mingus Julie M A Cactus Light Blend Pink & White $ 7.00 Mingus Nicole A Informal Decorative LB Pink & Yellow $ 9.00 Mingus Whitney AA Informal Decorative White $ 7.00 Penhill Dark Monarch AA Informal Decorative Purple & Yellow $ 8.00 Show N' Tell AA Laciniated Dark Red & Yellow $ 9.25 Spartacus A Informal Decorative Dark Red $ 8.00 Timona Pastel A Semi-Cactus Light Blend Pink & Yellow New from UK $ 8.75 Verda A Semi-Cactus White $ 6.50