Penstemon (Beardtongue) in Zone 5a & 5b

Penstemon digitalis

When to plant penstemon (beardtongue) in zone 5b

Zones 5a and 5b 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	Apr 12–Apr 19
Estimated bloom	Apr 11 '28–Apr 18 '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 5's season

Zone 5b's frost-free window runs about 148 days, from May 10 to October 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 5b 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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