Blue Throatwort
Trachelium caeruleum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
36 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
7, 8, 9
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Mediterranean
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Trachelium caeruleum, commonly known as blue throatwort, is characterized by its striking blue flowers and has a bushy growth habit. This species is known for its drought tolerance and ability to thrive in poor soil conditions.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and encourage root growth.
- Transplant seedlings when they develop strong roots, typically after 6 weeks.
- Fertilize monthly with a balanced liquid fertilizer during the growing season.
- Prune lightly after flowering to promote bushier growth and future blooms.
- Mulch around plants to retain moisture and suppress weeds.
Pro Tip
Use well-draining soil and provide full sun for vibrant blooms.
Keep It Thriving
Care Guide
Do
- Water regularly but avoid overwatering ❌
- Deadhead spent flowers to encourage more blooms 🌸
- Apply a balanced fertilizer monthly during active growth
Don't
- Avoid letting the soil dry out completely ❌
- Don't overcrowd plants to ensure good air circulation
- Refrain from using high-nitrogen fertilizers late in the season
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Plant | ||||||||||||
| Winter Prep |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Blue Throatwort questions
What zones can Blue Throatwort grow in?
Blue Throatwort is hardy in USDA Zones 7–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Blue Throatwort deer resistant?
Yes — Blue Throatwort is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Blue Throatwort bloom?
Blue Throatwort typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Blue Throatwort need full sun?
Blue Throatwort does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Blue Throatwort drought tolerant?
Yes — once established (usually after the first full season), Blue Throatwort handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
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Grow Blue Throatwort with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
