Passage: 'Mme A. Meilland' forms elegant buds that open to large, cupped flowers with a high-centered form and an average diameter of 15 cm (5.9 in). Their color is a combination of pale yellow and crimson edges that depends on the location, the weather and changes as the flower fades. The durable flowers are very full, with 40 to 43 petals, survive rainy periods, and have a sweet and fruity fragrance that varies in its strength from mild to strong. The cultivar flowers continuously throughout the season up to the first frost.

Question: Up to what season do they cultivate flowers?
first frost