Cut flowers
Cosmos Planting Calculator
Cosmos bipinnatus / C. sulphureus
Everything you need to plan Cosmos: 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
- 12″
- Range 9–12″
- Planting pattern
- Intensive bed
- Time to first production
- 75–110 days from sowing
- Succession planting
- Recommended
- Every 28 days
- Start indoors
- 4 weeks before
- before last frost
- Production pattern
- Cut-and-come-again
- Pinch
Plan your Cosmos beds
Prefilled with Cosmos'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 12″Range 9–12″
Your plan
200
Total plants
Based on 1 plants/sq ft at 12″ spacing
- Seeds to start (10% buffer)
- 221
- 72-cell trays needed
- 4
- 128-cell trays needed
- 2
More Cosmos planning
Planning notes
- Horizontal netting
- Landscape fabric
- Pinching
Cut-and-come-again. A planting keeps producing new stems over a relatively long harvest period when it is picked regularly, so successive plantings are usually spaced farther apart.
- This crop can be direct sown.
- Pinching is commonly used in this production system.
- Support netting is commonly used.
- Landscape fabric is commonly used for spacing and weed control.