Showy Evening Primrose in Zone 8a & 8b
Oenothera speciosa
Yes, showy evening primrose grows in zones 8a and 8b and comes back each year. Plant it outside Mar 25–Apr 1.
When to plant showy evening primrose in zone 8b
Zones 8a and 8b 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 | Mar 25–Apr 1 |
| Estimated bloom | First real harvest the season after planting |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Before you plant: Showy evening primrose has a winter-hardiness note for zone 8b. See the details below.
Plant alongside it in zone 8b
These go outside within two weeks of showy evening primrose in zone 8b, so one planting day can cover them.
- NasturtiumApr 1–Apr 8
- MarigoldApr 1–Apr 8
- African DaisyMar 25–Apr 1
- Amaranthus (Love-Lies-Bleeding)Mar 25–Apr 1
- Ammi (False Queen Anne's Lace)Mar 25–Apr 1
- Ammobium (Winged Everlasting)Mar 25–Apr 1
Showy evening primrose is the most aggressive plant here, and the extension source says so directly rather than hinting at it.
How showy evening primrose fits zone 8's season
Zone 8b's frost-free window runs about 230 days, from March 25 to November 10. Showy evening primrose takes about 1 growing season to reach full flowering, so what matters here is how many of these seasons it gets, not whether one is long enough.
Showy evening primrose is hardy in zones 5-8, so in zone 8b it stays in the ground through winter and comes back rather than being replanted. Allow about 2 ft of spread at maturity.
Showy Evening Primrose planting windows in every zone
Zone 8b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 5a & 5b | Not usually | May 10–May 17 | First real harvest the season after planting |
| 6a & 6b | Not usually | Apr 25–May 2 | First real harvest the season after planting |
| 7a & 7b | Not usually | Apr 10–Apr 17 | First real harvest the season after planting |
| 8a & 8b (your zone) | Not usually | Mar 25–Apr 1 | First real harvest the season after planting |
Good companions
No well-established companions for showy evening primrose.
Where to buy showy evening primrose seeds
None of the seed suppliers we list carries showy evening primrose 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 showy evening primrose" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 8b calendar · Plan your beds in the Garden Designer →
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Growing Showy Evening Primrose in USDA zone 8b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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