- Name: Mexican Sunflower ‘Yellow Torch’ - Other Common Names: Tithonia / Torch Sunflower - Scientific Name: Tithonia Speciosa ‘Yellow Torch” - Color: Yellow - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Bloom Time: July - Frost - Hardiness Zone: 10 - 11 (But Reseeds Itself Easily So It Acts Like A Perennial) - Plant Height: 40 - 60" - Plant Spacing: 12 - 18" - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Quantity: 25 Seeds - Other: This Bright Cheery Mexican Sunflower Is Tolerant Of Heat & Drought. Get Your Camera Ready Because The Mexican Sunflower Is An Absolute Favorite Of Butterflies, Including Monarchs! Next Grab Your Scissors And Bring These Vibrant Blooms Indoors. They Make An Excellent Cut Flower And Will Really Liven Things Up!