The giantis the variety . The perennial types grow 4 to 6 ft tall with measuring 2 or 3 in. across – a far cry from the dinner-plate blooms of H. annuus. The perennial is suited to the back of the border, its strong bearing yellow or gorden blooms in late summer and early autumn. It is a sun lover but there are no special soil requirements – the only problem is that the plants deteriorate with age. Lift the clumps every 3 years and divide to prevent exhaustion.
VARIETIES: H. decapetalus has single, semi-double and double varieties, all of which are suitable for flower. The best of the singles is the large-flowered ‘Maximus’ (6 ft), but the perennial Sunflower which is most often recommended is the double ‘Loddon Gold’ (height 5 ft. Spacing 2 ft.
Flowering period: July- September).
Other recommended types are the semi-double ‘Triomphe de Gand’and Soleild’Or’
SITE AND SOIL: Any well-drained garden soil will do sun. thrives best in full
PROPAGATION: Sowunder glass or outdoors in April or divide clumps in autumn or spring.