Planting timing
When to plant sunflowers
Plant sunflowers on the cited sheets — not on a national calendar month. Regional and season notes stay source-specific.
Growing guidance is general information. Timing, spacing, and care depend on cultivar, weather, soil, and local conditions. Check the sources and adjust the plan for your garden.
Dates stay on the named cards below — not one planting window.
Spacing lives on the sunflowers hub. Timing stays on the cited sheets.
Spacing lives on how to grow sunflowers.
What the sources say — at a glance
One source per card. Facts are not averaged.
UMN Extension (Minnesota)
After frost has passed. Indoor until true leaves.
Details and limits (3)
When
UMN Extension (Minnesota): direct seed sunflowers after all danger of frost has passed.
When
UMN Extension (Minnesota): germinate indoors and plant in the garden once true leaves have formed.
Limit
Not one BioArva calendar and not a ZIP tool.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
Verified suppliers only
No supplier on this page
When a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
What to record in the Field Book
Save the bed with the crop and the date. You may add a photo and notes. Compare entries you have recorded with each other — not with a diagnosis from this page. If you want an identification, bring the record to local Extension.
How we know — methodology. Ranges and assertions are cited per source, not blended.