Growing Cerinthe (Honeywort): A Complete Profile
By Growing Home Greens Team · August 10, 2026
Cerinthe, commonly called honeywort, doesn’t look like a typical cut flower. Its waxy, blue-purple bracts have an almost succulent texture, more sculptural than floral, which is exactly why it’s grown.
A patient, wide germination window
Transplanting is recommended, starting seed 6 weeks before your last frost, though direct-seeding after the last frost also works. Sow a quarter inch deep. Germination is unusually variable, taking anywhere from 5 to 21 days at 65-85°F, so don’t assume a slow tray has failed; give it the full window before troubleshooting. Space plants 12 to 18 inches apart.
A pollinator magnet
Cerinthe draws pollinators strongly, more than most ornamentals in this dataset, which makes it worth planting near vegetable crops that depend on pollinator visits rather than off in a purely decorative bed.
Harvest timing
Cut for a vase once the bracts have darkened to blue and the small tubular flowers have turned purple; picking earlier, while the bracts are still green, gives a shorter-lived stem.
Cerinthe has no recorded companions or antagonists in our data. See the full companion guide for cerinthe for how it’s tracked. Its pollinator draw makes it a good fit tucked into the Garden Designer near pollinator-dependent vegetables like squash or cucumbers.
Source: Cerinthe: Key Growing Information, Johnny’s Selected Seeds.
Companion planting guide for Cerinthe (Honeywort) · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Cerinthe (Honeywort) tolerates either.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Cerinthe (Honeywort) plants fit per square foot?
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Varieties worth considering
- Straight-species cerinthe (Cerinthe major): Johnny's Selected Seeds sells this species, sometimes in the 'Purpurascens' form with the deepest bract color; the growing requirements are the same either way, so the species itself covers what matters for care. (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 cerinthe 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 cerinthe (honeywort)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Cerinthe (Honeywort): Grown for its blue-purple, waxy bracts that look almost succulent rather than for a conventional petaled flower, and a strong pollinator draw.
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