Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flower-heads, double in many cultivars, in summer and autumn
Small-flowered Decorative dahlias have fully double flowerheads 10-15cm across, with broad, flat, blunt-tipped ray florets
'Gallery Art Deco' has flowerheads 10cm diameter, the outer florets light orange-yellow, the inner florets orange, all deep red on the reverse