Cut flowers
Sunflower Planting Calculator
Helianthus annuus
Everything you need to plan Sunflower: recommended spacing, how many plants and seeds you'll need, when to start, and when to expect blooms. Defaults come from grower references and every value is editable.
At a glance
- Recommended spacing
- 6″
- Range 6–18″
- Planting pattern
- Intensive bed
- Time to first production
- Varies by variety
- Enter your supplier's maturity value to estimate
- Succession planting
- Recommended
- Every 14 days
- Start indoors
- 4 weeks before
- before last frost
- Production pattern
- One-hit producer
Plan your Sunflower beds
Prefilled with Sunflower's recommended spacing. Adjust your bed size to get plant counts, seeds to start, and tray requirements.
Loads recommended spacing and planting pattern. You can override anything.
ft
ft
in
Default 6″Range 6–18″
Your plan
700
Total plants
Based on 3.5 plants/sq ft at 6″ spacing
- Seeds to start (10% buffer)
- 771
- 72-cell trays needed
- 11
- 128-cell trays needed
- 7
More Sunflower planning
Planning notes
One-hit producer. A planting gives a concentrated harvest over a short window, so more frequent successive plantings are used to keep a continuous supply.
- This crop can be direct sown.
- First-production timing varies by cultivar and growing system, so enter the maturity value from your seed supplier to estimate production.