- Name: Arrowleaf Balsamroot - Other Common Names: Oregon Sunflower - Scientific Name: Balsamorhiza Sagittata - Color: Yellow Flowers - Plant Seeds: Fall / Cold Stratify / Outdoors After Frost / Indoors Weeks Before Last Frost - Plant Height: 18 - 24" - Plant Spacing: 18 - 24” - Bloom Time: Late Spring - Early Summer (Apr - July) - Hardiness Zone: 3 - 10 - Light Requirements: Sun - Soil & Water Preferences: Average - Dry - Quantity: 50 Seeds - Other: This Lovely Western Us Native Wildflower Has Huge Vibrant 2 1/2 - 4" Wide Fragrant Flowers. More Info Coming Soon :)