Zinnia

Zinnia elegans, native to Mexico, is one of the flowers Dubai Municipality plants each September–October alongside Marigold for cool-season colour, chosen in part because it establishes and flowers fast from seed rather than needing to be grown on for months. It is one of the quickest routes to reliable colour in a Dubai bed, often flowering within three to six weeks of sowing, which makes it a practical choice for anyone planting a garden fresh at the start of the cool season and wanting results before winter properly sets in.

It's a bushy, upright annual on branching stems, ranging from 15 cm dwarf forms good for containers and bed edges to 90 cm cut-flower types suited to the back of a border. Flower colour covers almost every shade except true blue — clean whites, hot pinks, deep reds, oranges and lime greens are all commonly available — and it's one of the most popular annuals for cutting anywhere in the world, holding well in a vase for a week or more with fresh water and a daily stem trim.

The main thing to manage is airflow: UF/IFAS extension notes that zinnias are prone to powdery mildew, especially late in the season or in humid, crowded conditions with overhead watering — giving plants space and watering at the base goes a long way in Dubai's own humid spells, particularly along the coast.

Deadheading spent blooms regularly keeps a zinnia bed flowering for longer, since the plant is genetically driven to stop producing new flowers once it sets enough seed. For cut-flower types especially, regular picking essentially serves the same purpose as deadheading — the more flowers taken, the more the plant produces.