Wax Begonia in Zone 4a & 4b
Begonia semperflorens
Yes, wax begonia grows in zones 4a and 4b. Start seeds indoors Feb 20–Feb 27 and plant out May 29–Jun 5.
When to plant wax begonia in zone 4b
Zones 4a and 4b share the same average frost dates, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Feb 20–Feb 27 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated bloom | Aug 27–Sep 3 (~90 days after transplanting) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 0.5-2 ft.
Plant alongside it in zone 4b
These go outside within two weeks of wax begonia in zone 4b, so one planting day can cover them.
- NasturtiumMay 22–May 29
- MarigoldMay 22–May 29
- Angelonia (Summer Snapdragon)May 29–Jun 5
- Bee BalmMay 29–Jun 5
- Black-Eyed Susan VineMay 29–Jun 5
- Cleome (Spider Flower)May 29–Jun 5
Wax begonia is the low, glossy-leaved bedding plant that flowers steadily from summer into autumn in shade.
How wax begonia fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Wax begonia needs about 90 days from transplant to first bloom.
Wax Begonia planting windows in every zone
Zone 4b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 3a & 3b | Mar 7–Mar 14 | Jun 13–Jun 20 | Sep 11–Sep 18 |
| 4a & 4b (your zone) | Feb 20–Feb 27 | May 29–Jun 5 | Aug 27–Sep 3 |
| 5a & 5b | Feb 15–Feb 22 | May 24–May 31 | Aug 22–Aug 29 |
| 6a & 6b | Jan 31–Feb 7 | May 9–May 16 | Aug 7–Aug 14 |
| 7a & 7b | Jan 16–Jan 23 | Apr 24–May 1 | Jul 23–Jul 30 |
| 8a & 8b | Dec 31–Jan 7 | Apr 8–Apr 15 | Jul 7–Jul 14 |
| 9a & 9b | Nov 23–Nov 30 | Mar 1–Mar 8 | May 30–Jun 6 |
| 10a & 10b | Nov 7–Nov 14 | Feb 13–Feb 20 | May 14–May 21 |
| 11a & 11b | Oct 9–Oct 16 | Jan 15–Jan 22 | Apr 15–Apr 22 |
Bloom dates are about 90 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
No well-established companions for wax begonia.
Where to buy wax begonia seeds
None of the seed suppliers we list carries wax begonia 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 wax begonia" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Plan your beds in the Garden Designer →
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Growing Wax Begonia in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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