Didiscus (Blue Lace Flower) in Zone 6a & 6b
Trachymene coerulea
Yes, didiscus (blue lace flower) grows in zones 6a and 6b. Plant it outside Apr 25–May 2.
When to plant didiscus (blue lace flower) in zone 6b
Zones 6a and 6b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Apr 25–May 2 |
| Estimated bloom | Jul 24–Jul 31 (~90 days after direct-sowing) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Plant alongside it in zone 6b
These go outside within two weeks of didiscus (blue lace flower) in zone 6b, so one planting day can cover them.
- NasturtiumMay 2–May 9
- MarigoldMay 2–May 9
- African DaisyApr 25–May 2
- Amaranthus (Love-Lies-Bleeding)Apr 25–May 2
- Ammi (False Queen Anne's Lace)Apr 25–May 2
- Ammobium (Winged Everlasting)Apr 25–May 2
Didiscus, also called blue lace flower, is a sweet-scented cut flower that pairs stiff, sturdy stems with a delicate, lacy flower head, an unusual combination that makes it a favorite for bouquets.
How didiscus (blue lace flower) fits zone 6's season
Zone 6b's frost-free window runs about 173 days, from April 25 to October 15. Didiscus (blue lace flower) needs about 90 days from sowing to first bloom.
Didiscus (Blue Lace Flower) planting windows in every zone
Zone 6b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Not usually | May 20–May 27 | Aug 18–Aug 25 |
| 3a & 3b | Not usually | May 30–Jun 6 | Aug 28–Sep 4 |
| 4a & 4b | Not usually | May 15–May 22 | Aug 13–Aug 20 |
| 5a & 5b | Not usually | May 10–May 17 | Aug 8–Aug 15 |
| 6a & 6b (your zone) | Not usually | Apr 25–May 2 | Jul 24–Jul 31 |
| 7a & 7b | Not usually | Apr 10–Apr 17 | Jul 9–Jul 16 |
| 8a & 8b | Not usually | Mar 25–Apr 1 | Jun 23–Jun 30 |
| 9a & 9b | Not usually | Feb 15–Feb 22 | May 16–May 23 |
| 10a & 10b | Not usually | Jan 30–Feb 6 | Apr 30–May 7 |
| 11a & 11b | Not usually | Jan 1–Jan 8 | Apr 1–Apr 8 |
Bloom dates are about 90 days after the sow or plant-out date.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
No well-established companions for didiscus (blue lace flower).
Where to buy didiscus seeds
None of the seed suppliers we list carries didiscus seeds right now. A local garden center or a specialty seed house is the place to look.
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing didiscus (blue lace flower)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 6b calendar · Plan your beds in the Garden Designer →
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Growing Didiscus (Blue Lace Flower) in USDA zone 6b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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