Growing Didiscus (Blue Lace Flower): A Complete Profile
By Growing Home Greens Team · August 10, 2026
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.
Direct-seed for the best roots
Direct-seeding is recommended, done after the last frost, with the seed covered rather than left exposed since darkness aids germination. Transplanting is possible, started 4 to 6 weeks before the last frost, but the plant dislikes root disturbance, and direct-sown plants noticeably outperform transplanted ones. Germination takes 14 to 21 days at 70-72°F. Sow a new round every 2 to 3 weeks from spring through summer for continuous blooms. Space plants 6 to 12 inches apart.
Harvest
Cut once about half the flowers on the umbel have opened. Vase life runs 8 to 10 days, among the longer-lasting cut flowers in this dataset.
Didiscus has no recorded companions or antagonists in our data. See the full companion guide for didiscus for how it’s tracked. At 2 plants per square foot, it’s a good direct-sown addition to a cutting bed in the Garden Designer, planned in succession for continuous cuts through the season.
Source: Didiscus: Key Growing Information, Johnny’s Selected Seeds.
Companion planting guide for Didiscus (Blue Lace Flower) · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Method: Direct sow: Direct-sow outside. Didiscus (Blue Lace Flower) doesn't transplant well, or doesn't need the extra time indoors.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Didiscus (Blue Lace Flower) plants fit per square foot?
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Varieties worth considering
- 'Lacy Lavender Blue' didiscus: Johnny's Selected Seeds recommends this as a sweet-scented cut flower with stiff stems and delicate appearance, one of their standard didiscus color offerings. (source)
- 'Lacy White' didiscus (best for: white color): Johnny's Selected Seeds lists this as sharing the same sweet-scented, stiff-stemmed, delicate character as Lacy Lavender Blue, in white. (source)
- 'Lacy Pink' didiscus (best for: pink color): Johnny's Selected Seeds lists this as the pink color option in the same Lacy series, also sold as an organic seed. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy didiscus seeds
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews. See the sources cited on each item.
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)
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Growing Didiscus (Blue Lace Flower): A sweet-scented cut flower with stiff stems and a delicate, lacy look, whose roots dislike disturbance.
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