Sunflower

Sunflowers grow best in well-drained soil with a pH of 6.0-7.5 and moderate fertility. Incorporate compost before sowing, avoid excess nitrogen, and stake tall cultivars in exposed sites.

Sun

Full sun

Water

1 in/week

Spacing

18 in

First harvest

70–100 days

Tips

• Sow seeds 1 inch deep after the soil warms and thin large plants to about 18 inches apart.
• Water deeply to supply about 1 inch weekly, increasing water during hot weather on sandy soils.
• Use a modest application of balanced fertilizer only if soil fertility is low.
• Check young seedlings for slug damage and protect them with barriers or a labeled bait when needed.
• Cut flowers as petals begin opening, or leave mature flower heads for birds.