Also known as Sea Holly · 814 saves
Eryngium
Eryngium, the genus most gardeners know as sea holly. We track 21 varieties; the ones most used by real gardeners.
The 18 most-saved Eryngium varieties
Browse all 21 Eryngium varieties →
9 species of Eryngium
Each one is a parent of the varieties above.
Track your Eryngium in Sow
Save the Eryngium you grow and get care reminders timed to your zone.
How to grow Eryngium
Whats common across all Eryngium varieties in our catalog — drawn from the care records of the 21 most-grown of them.
The Eryngium year
- Spring CleanupFebruary and March90% of varieties
Cut back old, dried stems to the ground before new growth emerges
- HarvestJuly and August52% of varieties
Harvest flowers when fully developed for fresh or dried arrangements
- PlantMarch, April, September and October48% of varieties
Plant containerized plants in spring or early fall
- PropagateJanuary and February48% of varieties
Propagate by root cuttings in late winter/early spring.
- DeadheadAugust and September38% of varieties
Leave spent flower heads for winter interest and bird food.
Do
- Water sparingly once established 💧
- Apply a balanced fertilizer in spring
- Mulch to conserve moisture and suppress weeds
- Water sparingly, allowing soil to dry out between watering 🌱
- Prune dead or damaged stems to encourage new growth
Avoid
- Overwater, which can cause root rot ❌
- Avoid overwatering, which can cause root rot ❌
- Don’t disturb roots during flowering
- Don’t disturb roots during the growing season
What goes wrong with Eryngium
| Problem | What you'll see | What to do |
|---|---|---|
| Aphids | Sticky honeydew and distorted leaves | Apply insecticidal soap or neem oil |
| Root rot | Wilting and blackened roots | Improve soil drainage and reduce watering |
| Snails and slugs | Holes in leaves, slime trails | Apply iron phosphate bait or handpick at dusk |
| Spider mites | Fine webbing on foliage | Use insecticidal soap or horticultural oil |
| Root rot | Wilting and browning of roots | Improve soil drainage and reduce watering |
| Powdery mildew | White powder on foliage | Apply fungicide or neem oil |
| Fungal root rot | Wilting and browning roots | Improve drainage and apply a fungicide |
Making more Eryngium
Seed
- Tuck seeds into moist soil surface in early spring
- Keep soil consistently moist for 2 weeks
- Thin seedlings to proper spacing after germination
Division
- Dig up mature plants in early spring or fall
- Separate clumps with a sharp knife or spade
- Replant divisions immediately in prepared soil
- Water thoroughly after planting
Eryngium questions
How many types of Eryngium are there?
The Sow catalog tracks 21 distinct Eryngium varieties. The most popular — ranked by 814 real gardeners — are shown first above.
What zones does Eryngium grow in?
Across its varieties, Eryngium covers USDA Zones 4–10. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Eryngium bloom?
Most Eryngium varieties bloom in late summer, mid-summer, summer to fall. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Eryngium 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.