Yarrow in Zone 9a & 9b
Achillea millefolium
Yes, yarrow grows in zones 9a and 9b. Start seeds indoors Dec 14–Dec 21 and plant out Feb 15–Feb 22.
When to plant yarrow in zone 9b
Zones 9a and 9b share the same average frost dates, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Either works.
| Start indoors | Dec 14–Dec 21 |
|---|---|
| Direct sow / transplant outside | Feb 15–Feb 22 |
| Estimated bloom | May 26–Jun 2 (~100 days after planting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Plant alongside it in zone 9b
These go outside within two weeks of yarrow in zone 9b, so one planting day can cover them.
- NasturtiumFeb 22–Mar 1
- MarigoldFeb 22–Mar 1
- African DaisyFeb 15–Feb 22
- Amaranthus (Love-Lies-Bleeding)Feb 15–Feb 22
- Ammi (False Queen Anne's Lace)Feb 15–Feb 22
- Ammobium (Winged Everlasting)Feb 15–Feb 22
Yarrow is a hardy perennial known for its flat-topped flower clusters and its toughness once established. It tolerates poor soil, drought, and deer browsing better than most garden flowers.
How yarrow fits zone 9's season
Zone 9b's frost-free window runs about 293 days, from February 15 to December 5. Yarrow needs about 100 days from sowing to first bloom.
Yarrow planting windows in every zone
Zone 9b 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 28–Apr 4 | May 30–Jun 6 | Sep 7–Sep 14 |
| 4a & 4b | Mar 13–Mar 20 | May 15–May 22 | Aug 23–Aug 30 |
| 5a & 5b | Mar 8–Mar 15 | May 10–May 17 | Aug 18–Aug 25 |
| 6a & 6b | Feb 21–Feb 28 | Apr 25–May 2 | Aug 3–Aug 10 |
| 7a & 7b | Feb 6–Feb 13 | Apr 10–Apr 17 | Jul 19–Jul 26 |
| 8a & 8b | Jan 21–Jan 28 | Mar 25–Apr 1 | Jul 3–Jul 10 |
| 9a & 9b (your zone) | Dec 14–Dec 21 | Feb 15–Feb 22 | May 26–Jun 2 |
Bloom dates are about 100 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
No well-established companions for yarrow.
Where to buy yarrow seeds
True Leaf Market · High Mowing Organic Seeds (each supplier's yarrow seeds)
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See it growing
Search YouTube for "growing yarrow" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 9b calendar · Plan your beds in the Garden Designer →
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Growing Yarrow in USDA zone 9b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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