Three families to know

Zinnia elegans: the big, classic dahlia-like blooms. 'Benary's Giant' series is the cut-flower standard.

Zinnia profusa / haageana: smaller, branching, weather-resistant — ideal where summers are wet or unreliable.

Z. 'Queen Lime' / 'Queeny' series: muted, antique tones — favourite of florists.