Penstemon (Beardtongue) in Zone 3a & 3b
Penstemon digitalis
Yes, penstemon (beardtongue) grows in zones 3a and 3b and comes back each year. Plant it outside May 2–May 9.
When to plant penstemon (beardtongue) in zone 3b
Zones 3a and 3b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 2–May 9 |
| Estimated bloom | First real harvest the season after planting |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-4 ft.
Before you plant: Penstemon (beardtongue) has a winter-hardiness note for zone 3b. See the details below.
Plant alongside it in zone 3b
These go outside within two weeks of penstemon (beardtongue) in zone 3b, so one planting day can cover them.
- Bleeding HeartMay 2–May 9
- LarkspurMay 2–May 9
- Black-Eyed SusanMay 9–May 16
- Clarkia (Farewell-to-Spring)May 9–May 16
- Cynoglossum (Chinese Forget-Me-Not)May 9–May 16
- Phacelia (Lacy Phacelia)May 9–May 16
Penstemon digitalis is a tough North American native that flowers in early summer and asks for very little.
How penstemon (beardtongue) fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Penstemon (beardtongue) takes about 1 growing season to reach full flowering, so what matters here is how many of these seasons it gets, not whether one is long enough.
Penstemon (beardtongue) is hardy in zones 3-8, so in zone 3b it stays in the ground through winter and comes back rather than being replanted. Allow about 1.75 ft of spread at maturity.
Penstemon (Beardtongue) planting windows in every zone
Zone 3b 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 (your zone) | Not usually | May 2–May 9 | First real harvest the season after planting |
| 4a & 4b | Not usually | Apr 17–Apr 24 | First real harvest the season after planting |
| 5a & 5b | Not usually | Apr 12–Apr 19 | First real harvest the season after planting |
| 6a & 6b | Not usually | Mar 28–Apr 4 | First real harvest the season after planting |
| 7a & 7b | Not usually | Mar 13–Mar 20 | First real harvest the season after planting |
| 8a & 8b | Not usually | Feb 25–Mar 4 | First real harvest the season after planting |
Good companions
No well-established companions for penstemon (beardtongue).
Where to buy penstemon seeds
Botanical Interests · True Leaf Market (each supplier's penstemon seeds)
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing penstemon (beardtongue)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 3b calendar · Plan your beds in the Garden Designer →
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Growing Penstemon (Beardtongue) in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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