Sunflower Seed Planting Calculator

Estimate seeds needed, spacing, planting holes, and packet requirements for your sunflower garden.

🌻 Sunflower Type (optional, for spacing guide)

🌱 Garden Area (square feet)

📏 Plant Spacing (inches)

🌱 Seeds per planting hole

📦 Seed packet size (seeds per packet)

🌻 Sunflower Planting Summary

0 seeds

📏 Planting Holes

🌱 Plants after thinning

📦 Packets needed

🌻 Est. harvest yield (seed heads)

🌻 Sunflower planting guide: Sow seeds directly after last frost. Plant 1-2 inches deep, spacing according to variety. Water well. Thin to strongest plant per hole when seedlings are 4-6 inches tall.

💡 Pro tip: Dwarf sunflowers (12″ spacing) are great for borders. Giant varieties need 36″+ for massive heads. Use 2 seeds per hole to ensure germination — thin later.