About Sunflowers
Sunflowers (Helianthus annuus) are the ultimate feel-good garden flower. From towering 12-foot giants with dinner-plate-sized heads to compact 2-foot branching varieties perfect for cutting gardens, there's a sunflower for every space. They're fast-growing, dramatic, and provide food for pollinators (bees work the blooms all day) and birds (seeds feed finches through winter). Multi-branching varieties are particularly valuable — each plant produces multiple stems, each with its own flower.
Planting from Seed
Direct sow outdoors after the last frost when soil has warmed to at least 60°F. Plant seeds 1 to 1.5 inches deep and 6 to 24 inches apart depending on variety — 6 inches for cut-flower types, 12 to 24 inches for branching varieties, 18 to 30 inches for giants. Germination is fast and reliable: 7 to 10 days. If starting indoors, sow just 2 to 3 weeks before transplanting, as sunflowers grow fast and develop taproots quickly.
Growing Conditions
Plant in full sun — 6 to 8 hours or more of direct sunlight daily. Sunflowers are heavy feeders that perform best in nutrient-rich, well-drained soil amended with compost or aged manure. They tolerate a wide soil pH range (6.0-7.5). Protect tall varieties from strong winds if possible, or stake them. A south-facing location along a fence provides both sun and wind protection.
Watering & Feeding
Keep soil evenly moist through germination and early growth. Once established, water deeply but infrequently to encourage deep rooting — sunflowers are moderately drought-tolerant. They're heavy feeders: work compost into the soil at planting time and side-dress with a balanced fertilizer when plants are 1 foot tall. Avoid high-nitrogen fertilizers, which produce tall, weak stems.
Succession Planting & Cut Flowers
For continuous blooms all summer, plant a new batch of seeds every 2 to 3 weeks from last frost through early July. For cut flowers, harvest when petals are just beginning to open — they'll last 7 to 12 days in a vase. Cut in early morning and place immediately in water. Sunflowers are stunning combined with dahlias, cosmos, and lisianthus in large arrangements, or standing alone in a simple vase for bold, cheerful impact. Leave some seed heads on the plant at end of season to feed birds.