Dusty Miller in Zone 8a & 8b
Senecio cineraria
Yes, dusty miller grows in zones 8a and 8b. Start seeds indoors Jan 21–Jan 28 and plant out Apr 1–Apr 8.
When to plant dusty miller in zone 8b
Zones 8a and 8b 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 | Jan 21–Jan 28 |
|---|---|
| Direct sow / transplant outside | Apr 1–Apr 8 |
| Estimated bloom | Jun 30–Jul 7 (~90 days after transplanting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 0.5-1 ft.
Plant alongside it in zone 8b
These go outside within two weeks of dusty miller in zone 8b, so one planting day can cover them.
- NasturtiumApr 1–Apr 8
- MarigoldApr 1–Apr 8
- Ageratum (Flossflower)Apr 1–Apr 8
- AmaryllisApr 1–Apr 8
- Annual Geranium (Pelargonium)Apr 1–Apr 8
- Butterfly Weed (Asclepias)Apr 1–Apr 8
Dusty miller is grown for its silvery, felted foliage rather than for any flower, a classic bedding and container plant that also earns a spot as a fresh-cut filler that softens bolder bouquet colors.
How dusty miller fits zone 8's season
Zone 8b's frost-free window runs about 230 days, from March 25 to November 10. Dusty miller needs about 90 days from transplant to first bloom.
Dusty Miller 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 |
|---|---|---|---|
| 2a & 2b | Mar 18–Mar 25 | May 27–Jun 3 | Aug 25–Sep 1 |
| 3a & 3b | Mar 28–Apr 4 | Jun 6–Jun 13 | Sep 4–Sep 11 |
| 4a & 4b | Mar 13–Mar 20 | May 22–May 29 | Aug 20–Aug 27 |
| 5a & 5b | Mar 8–Mar 15 | May 17–May 24 | Aug 15–Aug 22 |
| 6a & 6b | Feb 21–Feb 28 | May 2–May 9 | Jul 31–Aug 7 |
| 7a & 7b | Feb 6–Feb 13 | Apr 17–Apr 24 | Jul 16–Jul 23 |
| 8a & 8b (your zone) | Jan 21–Jan 28 | Apr 1–Apr 8 | Jun 30–Jul 7 |
| 9a & 9b | Dec 14–Dec 21 | Feb 22–Mar 1 | May 23–May 30 |
| 10a & 10b | Nov 28–Dec 5 | Feb 6–Feb 13 | May 7–May 14 |
| 11a & 11b | Oct 30–Nov 6 | Jan 8–Jan 15 | Apr 8–Apr 15 |
Bloom dates are about 90 days after the sow or plant-out date, not after starting seeds indoors.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
No well-established companions for dusty miller.
Where to buy dusty miller seeds
True Leaf Market · Burpee (each supplier's dusty miller seeds)
Varieties we recommend, and where to get them:
- 'Silverdust' dusty miller: Johnny's Selected Seeds describes this as having finely cut leaves with a snowflake appearance, an elegant filler form of the species that's a common named selection in the seed trade. Buy: Botanical Interests Full notes
- 'New Look' dusty miller (best for large lobed leaves): Johnny's Selected Seeds describes this as having large, deeply lobed, flat silvery leaves for an elegant bouquet filler, a broader-leaved look than the finely cut Silverdust above. Buy: True Leaf Market Full notes
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing dusty miller" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Dusty Miller in USDA zone 8b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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