When it arrives
Your plug tray
Plant plugs after frost in full sun, or pot up in gritty mix. Water lightly and let soil dry a bit between waterings; overwatering is the biggest risk for young penstemon.
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Pink Pearls grown by our community
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- Mature height
- 20.0 in
- Mature spread
- 24.0 in
- Bloom
- Late-May – peak Mid-June
- Fragrance
- None
- Deer
- Moderately resistant
Lavender companion · grow guide
How to grow Pink Pearls
Penstemon · Penstemon barbatus
Penstemon needs full sun and very well-drained soil. Poor drainage is the main reason it fails; many types are short-lived, but in lean, gritty soil they bloom reliably.
Check my zone & planting dates
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Full sunLight
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Low waterFast drainage
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pH 6.0–8.0Soil
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Zones 4a–8bHardiness
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20″ tall24″ wide
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Some resistanceDeer · rabbits some resistance
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Not known toxicPets
Huckleberry saysTell me where you grow and I’ll check if Pink Pearls will thrive there.
Hardy in zones 4a–8b
Spring after frost, or early fall at least 6 weeks before freeze.
Your year with Pink Pearls
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When to plant
Spring after frost, or early fall at least 6 weeks before freeze.
How deep
Set the crown exactly at soil level. Burying the crown or piling mulch against it invites rot.
Spacing
About 12–18 in apart, more for large types.
Soil
Sandy, gravelly or loose loam; not compacted · pH 6.0–8.0
Fix-it tip: Loosen compacted soil and add grit or plant in raised beds. Skip rich compost. Gravel mulch helps keep crowns dry. Hybrid types are more forgiving of heavier soil than western species like P. barbatus.
Sun
Full sun (tolerates part sun).
More shade means fewer flowers and leggy stems.
Don’t give up on it
Is it alive? What spring looks like
Many types keep a low rosette of leaves through winter, often reddish or purple. New growth starts early to mid spring.
Spring
Clean up old stems; keep crowns uncovered.
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Summer
Bloom; deadhead after.
Fall
Leave basal rosettes; plant early fall.
Winter
Keep drainage good; no heavy mulch on crowns.
Watering
First season: Water after planting, then only when the top inch dries; don't keep new plants soggy.
After that: Drought tolerant once established but likes spring moisture. Avoid heavy watering after bloom.
Feeding
Usually none in garden soil. Potted plants benefit from a light feeding in spring.
Pruning & deadheading
Deadhead after bloom to tidy and sometimes get rebloom. Leave the basal rosette alone in fall; clean up old stems in spring.
Dividing
Every few years in spring to keep vigorous; many types are short-lived, so letting a few seedlings grow keeps them in the garden.
Winter
P. barbatus is hardy to about zone 4 or colder. Wet winter soil is the main killer. A light winter mulch helps in cold areas, but keep it off the crown.
Summer heat
Takes heat well. Humidity and wet soil can cause leaf spot and rot.
Plant collapsed or didn't return
Likely cause: Crown rot from poor drainage or wet winter
What to do: Replant in a raised, gritty spot with gravel mulch.
Spots on leaves
Likely cause: Leaf spot or rust, worse in humidity
What to do: Remove spotted leaves, water at the base, improve airflow.
Leggy, few flowers
Likely cause: Too much shade or rich soil
What to do: Move to full sun; stop feeding.
Too wet or too dry?
Blackened base and collapse: crown rot from wet soil. Blistered, corky leaf spots (edema): uneven watering. Wilting in drought: needs water.
Watch for
- Root and crown rot
- Leaf spot and rust
- Aphids
Pets & wildlife
Not listed by ASPCA; no known toxicity reported. Discourage pets from chewing any garden plant.
Deer: somewhat resistant · Rabbits: somewhat resistant
Finnegan saysStill not sure what’s wrong? Ask Plant Health — describe it or add a photo.
In a container
Good in pots · 1 gallon+
Compact types do well in pots with gritty, fast-draining mix.
Indoors
Outdoor plant
Needs full sun and an outdoor winter.
Winter chill
Best after a cold winter
Many penstemons, including beardtongue (P. digitalis) types, bloom best after a winter outdoors.
Growing it on
Plugs from the tray
3–4 inch pots for 3–5 weeks, until roots hold the soil
Garden bed or a 1 gallon pot
Time to move up? Slide the plant out: if white roots wrap the outside of the soil, it’s ready for the next size.
Planting with lavender
Plant it right alongside lavender
Same full sun, lean soil and sharp drainage. Penstemon's tubular flowers bloom with lavender and bring hummingbirds; dark-leaved types contrast nicely with gray lavender.
Same bedNearbyIts own area
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