Purple Loosestrife
Lythrum salicaria
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
4, 5, 6, 7, 8, 9
Water
Moist to wet soil
Humidity
Moderate to high
Lifespan
Perennial
Native To
Europe and Asia
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Lythrum salicaria, commonly known as purple loosestrife, is a perennial herb with striking tall spikes of purple flowers during summer. Highly invasive in North American wetlands, where it displaces native vegetation. Its sale is prohibited in many states.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
We couldn't find this plant listed online right now.
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Water regularly to keep soil consistently moist during growth.
- Mist cuttings in spring to encourage root development.
- Transplant seedlings after the last frost for optimal growth.
- Divide mature plants in early spring or fall to maintain vigor.
- Mulch around plants to retain moisture and suppress weeds.
Pro Tip
Ensure soil remains consistently moist and provide full sun for vibrant blooms.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist 🌱
- Prune after flowering to promote bushy growth
- Fertilize in early spring with a balanced fertilizer
Don't
- Avoid overwatering to prevent root rot ❌
- Don't neglect pruning, which maintains plant health
- Avoid planting in dense shade for best flowering
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Spring Cleanup |
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
Purple Loosestrife questions
What zones can Purple Loosestrife grow in?
Purple Loosestrife is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Purple Loosestrife deer resistant?
Yes — Purple Loosestrife is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Purple Loosestrife bloom?
Purple Loosestrife 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 Purple Loosestrife need full sun?
Purple Loosestrife does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Lythrum to compare
Keep exploring
Explore the genus
Collections featuring this plant
Grow Purple Loosestrife 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.
