Penstemon (Beardtongue) in Zone 8a & 8b

Penstemon digitalis

When to plant penstemon (beardtongue) in zone 8b

Zones 8a and 8b share the same average frost dates in our data, so this page covers both.

Method: Direct sow: Direct-sow outside. Penstemon (Beardtongue) doesn't transplant well, or doesn't need the extra time indoors.

Start indoors	Not typically started indoors
Direct sow / transplant outside	Feb 25–Mar 4
Estimated bloom	Feb 25 '28–Mar 3 '28 (First real harvest the season after planting)

Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-4 ft.

Penstemon digitalis is a tough North American native that flowers in early summer and asks for very little.

How penstemon (beardtongue) fits zone 8's season

Zone 8b's frost-free window runs about 230 days, from March 25 to November 10. 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 8b it stays in the ground through winter and comes back rather than being replanted. Allow about 1.75 ft of spread at maturity.

Good companions

No standout companions recorded yet for Penstemon (Beardtongue).

Where to buy penstemon seeds

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