Also known as Jacob's Ladder · 194 saves
Polemonium
Polemonium, the genus most gardeners know as jacob's ladder. We track 8 varieties; the ones most used by real gardeners.
The 8 most-saved Polemonium varieties
2 species of Polemonium
Each one is a parent of the varieties above.
Track your Polemonium in Sow
Save the Polemonium you grow and get care reminders timed to your zone.
How to grow Polemonium
Whats common across all Polemonium varieties in our catalog — drawn from the care records of the 8 most-grown of them.
The Polemonium year
- DivideMarch and September88% of varieties
Divide clumps every 3-4 years to maintain vigor
- DeadheadMay and June75% of varieties
Remove spent flower stalks to encourage rebloom and neatness
- Spring CleanupFebruary63% of varieties
Remove dead or damaged foliage before new growth begins
- MulchMarch and April63% of varieties
Apply organic mulch to keep roots cool and conserve moisture
- PlantMarch, April, September and October50% of varieties
Plant in spring or early fall in moist, well-drained soil
- PruneJune38% of varieties
Cut back foliage by half after initial bloom to refresh plant
Do
- Water regularly to keep soil moist 🌱
- Mulch around plants to retain moisture
- Mulch to retain soil moisture
- Divide every 3–4 years for renewal
- Water consistently during dry periods 🌱
Avoid
- Avoid overwatering to prevent root rot ❌
- Avoid dry or overly sunny locations ❌
- Don't let soil dry out completely
- Avoid heavy, compacted soils
What goes wrong with Polemonium
| Problem | What you'll see | What to do |
|---|---|---|
| Aphids | Sticky residue and distorted leaves | Spray with neem oil or insecticidal soap |
| Leafminers | Winding, white or tan trails within the leaves. | Remove and destroy affected leaves. Usually cosmetic. Spinosad-based organic insecticides can be effective if sprayed early. |
| Slugs | Holes in leaves, slime trails | Use organic slug bait or handpick at night |
| Slugs and snails | Holes in new spring foliage | Clear damp debris nearby; hand-pick after rain |
| Powdery mildew | White powder on leaves | Improve air circulation and apply fungicide |
| Powdery Mildew | White powdery coating on leaves | Improve air circulation and apply fungicide if necessary |
| Root rot | Wilting, yellowing leaves | Improve drainage and reduce watering |
Making more Polemonium
Division
- Dig up mature clumps in early spring.
- Separate smaller sections with a sharp knife or spade.
- Replant divisions immediately at same depth.
- Water thoroughly after planting.
- Repeat every 3-4 years for vigor.
Seeds
- Sow seeds on moist soil surface in fall or early spring.
- Keep soil consistently moist.
- Germination occurs in 2-3 weeks.
- Thin seedlings to proper spacing after emergence.
Polemonium questions
How many types of Polemonium are there?
The Sow catalog tracks 8 distinct Polemonium varieties. The most popular — ranked by 194 real gardeners — are shown first above.
What zones does Polemonium grow in?
Across its varieties, Polemonium covers USDA Zones 4–9. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Polemonium bloom?
Most Polemonium varieties bloom in late spring, early spring, late spring to early summer. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Polemonium should I choose?
Start from the most-saved varieties above — popularity across thousands of gardens is a strong signal of reliability — then filter by your zone and sun. In the Sow app you can preview any of them in a photo of your actual yard before you buy.