Growing China Aster: A Complete Profile
By Growing Home Greens Team · August 10, 2026
China aster is not related to the perennial garden asters despite the common name; it’s a true annual grown from seed each year for its full, peony-like cut-flower blooms.
Start early for long stems
Transplanting is recommended, sowing seed 6 to 8 weeks before planting out, an eighth of an inch deep. Flowering is triggered by heat and shortening daylength, which means an early start matters: plantings begun late tend to flower on short, stubby stems instead of the long ones a cut-flower row needs. Direct-seeding also works once soil reaches 65-70°F, but support should be provided either way. Germination takes 10 to 14 days at 70-72°F.
A real disease risk to watch for
Aster Yellows Virus, spread by leafhoppers, is a genuine threat to this crop. Row cover or insect netting over young plants helps keep the leafhoppers off before the plants are established enough to tolerate some pressure.
Harvest
Cut fresh once the outer ray florets begin to open, placing stems in water immediately. For drying, wait until blooms are fully open. Vase life runs 7 to 10 days.
China aster has no well-established companion pairings, and nothing it needs to be kept away from. At 4 plants per square foot, it’s a strong cut-flower option for the Garden Designer, started early and protected from leafhoppers while young.
Source: China Aster (Callistephus): Key Growing Information, Johnny’s Selected Seeds.
Companion planting guide for China Aster · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Mature height: 1.5-2.5 ft
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.
When to plant China aster, by zone
Every zone China aster grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Apr 1–Apr 8 | May 27–Jun 3 | Aug 25–Sep 1 |
| 3a & 3b | Apr 11–Apr 18 | Jun 6–Jun 13 | Sep 4–Sep 11 |
| 4a & 4b | Mar 27–Apr 3 | May 22–May 29 | Aug 20–Aug 27 |
| 5a & 5b | Mar 22–Mar 29 | May 17–May 24 | Aug 15–Aug 22 |
| 6a & 6b | Mar 7–Mar 14 | May 2–May 9 | Jul 31–Aug 7 |
| 7a & 7b | Feb 20–Feb 27 | Apr 17–Apr 24 | Jul 16–Jul 23 |
| 8a & 8b | Feb 4–Feb 11 | Apr 1–Apr 8 | Jun 30–Jul 7 |
| 9a & 9b | Dec 28–Jan 4 | Feb 22–Mar 1 | May 23–May 30 |
| 10a & 10b | Dec 12–Dec 19 | Feb 6–Feb 13 | May 7–May 14 |
| 11a & 11b | Nov 13–Nov 20 | 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.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many China Aster plants fit per square foot?
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1.5-2.5 ft.
Varieties worth considering
- Matsumoto series China aster (best for: disease resistance): A compact, bushy line Johnny's Selected Seeds markets as Fusarium resistant. Worth knowing because Fusarium (aster wilt) is a separate problem from the leafhopper-spread aster yellows below, and it is the one you can breed around just by choosing seed. (source)
- 'Tower Custom Mix' China aster: Johnny's Selected Seeds describes this as producing peony-type blooms, one of their standard China aster offerings for cut-flower growing. (source)
- 'Azumi XL' series China aster (best for: early bloom): Johnny's Selected Seeds lists this as a vigorous, early-blooming series available in red, blue, white and rose, worth choosing over Tower Custom Mix where an earlier bloom date matters more than the peony flower form. (source)
- 'Soufflé Light Pink' China aster (best for: pale color, early season): Johnny's Selected Seeds describes this as an early variety in a soft pale pink, a distinct color and bloom-time option from the two mixes above. (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy China aster seeds
None of the seed suppliers we list carries China aster seeds right now. A local garden center or a specialty seed house is the place to look.
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See it growing
Search YouTube for "growing China aster" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing China Aster: Not related to the perennial asters despite the common name, a true annual grown for its full, peony-like cut-flower blooms, with flowering triggered by heat and shortening daylength.
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