Helianthus salicifolius Willow-Leaved Sunflower Description Cheery yellow flowers top this stunnning western native in late summer to fall. Narrow lacy green foliage almost willow-like in appearance adds an interesting airy texture to the garden. Use in the back of the border. Great cut flower. Sizes & Prices All Sunflower Characteristics Hardiness Zone: 4-9 Light requirements: Sun Height: 8-10' Native: No Sizes & Prices Size: 2 Gal $16.98 Other Information Willow-Leaved Sunflower Helianthus salicifolius Zone: 4-9 Sun HT: 8-10' Willowleaf Sunflower Helianthus salicifolius 'First Light' Zone: 5-9 Sun HT: 3-4' Perennial Sunflower Helianthus x 'Lemon Queen' Zone: 4 Sun HT: 6'