Ranunculus in Zone 4a & 4b
Ranunculus asiaticus
When to plant ranunculus in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Ranunculus doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 8–May 15 |
| Estimated bloom | Aug 21–Aug 28 (~105 days after direct-sowing) |
Spacing: 5 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Ranunculus produces some of the most densely petaled, rose-like blooms of any corm in this group, but it comes with a genuine climate split: gardeners in mild-winter zones plant it in fall like the hardy bulbs, while everyone in colder zones plants it in spring instead.
How ranunculus fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Ranunculus needs about 105 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Ranunculus.
Where to buy ranunculus bulbs
We haven't vetted bulb/tuber suppliers yet. Our seed-supplier list below doesn't carry these. The growing-guide source cited above is a good starting point for where to buy.
See it growing
Search YouTube for "growing ranunculus" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Ranunculus in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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