Purple Loosestrife (Lythrum salicaria) is in the lythrum family family (Lythraceae). Across the U.S., iNaturalist users have logged 6,313 research-grade flowering observations of it in our sample, peaking in August.
Nationally it blooms mainly from July to September, but timing varies a lot by state and elevation — see the table below.
When to photograph Purple Loosestrife: observations by month (U.S.)
About Purple Loosestrife
Lythrum salicaria (purple loosestrife) is a flowering plant belonging to the family Lythraceae. It should not be confused with other plants sharing the name loosestrife that are members of the family Primulaceae. Other names include spiked loosestrife, or purple lythrum.From Wikipedia via iNaturalist — article, CC BY-SA.
Purple Loosestrife by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| New York | 1,041 | August | Jul–Sep |
| Massachusetts | 782 | August | Jul–Sep |
| Vermont | 702 | August | Jul–Sep |
| Pennsylvania | 474 | August | Jul–Sep |
| Minnesota | 415 | August | Jul–Aug |
| New Jersey | 391 | August | Jul–Sep |
| Michigan | 343 | August | Jul–Sep |
| Washington | 305 | August | Jul–Sep |
| Ohio | 272 | August | Jul–Aug |
| Maine | 252 | August | Jul–Aug |
| New Hampshire | 212 | August | Jul–Aug |
| Illinois | 180 | August | Jul–Sep |
| Wisconsin | 136 | August | Jul–Aug |
| Connecticut | 115 | August | Jul–Sep |
| Maryland | 90 | July | Jun–Sep |
| Oregon | 89 | August | Jul–Sep |
| Indiana | 72 | August | Jul–Sep |
| Virginia | 65 | July | Jun–Aug |
| Kentucky | 61 | August | Jun–Sep |
| Delaware | 58 | July | Jul–Sep |
| Utah | 44 | August | Jul–Sep |
| Idaho | 35 | August | Jul–Sep |
| District of Columbia | 34 | July | Jun–Sep |
| West Virginia | 31 | July | Jul–Sep |
| Rhode Island | 26 | August | Jul–Aug |
| Iowa | 20 | July | Jul–Sep |
| Missouri | 11 | July | Jun–Aug |
| Nebraska | 11 | August | Jul–Sep |
| Colorado | 8 | August | Jul–Aug |
| North Carolina | 8 | July | Jul–Aug |
| North Dakota | 8 | July | Jul–Aug |
| Tennessee | 6 | June | Jun–Sep |
Main season = months with at least 30% of the state's peak-month count.
Photography tips
- Photograph flowers on calm, overcast mornings to avoid wind blur and harsh shadows.
- Get low: a shallow depth of field (f/2.8–f/5.6) isolates a bloom against soft color.
- Stay on trails — trampling meadows kills plants and ruins next year's display.
- Try a kaleidoscope abstract of a single bloom with our online kaleidoscope tool.
FAQ
When is the best time to photograph Purple Loosestrife?
Nationally, August has the most observations, with the main season from July to September.
Where is Purple Loosestrife most often seen?
The most observations come from New York, Massachusetts, Vermont.