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. Characteristics Hardiness Zone: 4-9 Light requirements: Sun Height: 8-10' Native: No Sizes & Prices Size: 2 GALLON $16.98 Other Information All Sunflower Willow-Leaved Sunflower Helianthus salicifolius Zone: 4-9 Sun HT: 8-10' Perennial Sunflower Helianthus x 'Lemon Queen' Zone: 4 Sun HT: 6'