Grandifloras. Largest flowers, best in beds or containers. Large 10-12 cm (4 in) slightly ruffled blooms on 31 cm (1 ft) plants. Vivid burgundy.
Start seed 8 to 10 weeks prior to intended date of transplanting outside. Press seed into soil as light will aid germination. Germinates best at 24 C (75 F) in 5-15 days. Grow plants to budding stage at 12 C (55 F). Petunias lose dwarf growth habit if grown above that temperature. Fertilize every 2 weeks with 10-52-17 and liquid seaweed for strong healthy plants. Garden spacing 20-30 cm (8-12 in) apart. Pinch old flowers off to encourage more bloom.