Native Plants
Native Vascular Flora of the City of Alexandria
Native plants are those that naturally occur in a region, ecosystem, or habitat. These plants are often best suited to handle the specific environmental conditions of their native range and support the native wildlife that they have formed symbiotic relationships with over thousands of years.
Additional Resources for Native Plants
- 2015 Native Vascular Flora of the City of Alexandria, Virginia report
- 2010 Report for native plants and natural land restorations: Keeping it Natural
- 2008 Noteworthy Collections article in Castanea: Noteworthy Collections Update
Spring Ephemerals
Bloom Timing
Spring ephemerals only bloom briefly in the early to mid-spring before the tree canopy leafs out and blocks light.
Notable Species
These short-bloomed plants are beautiful harbingers of spring, including Virginia spring beauty (Claytona virginica) and Bluebells (Mertensia virginica).
Learn More
Read more about these special plants in Flora Spring Flowering Native Plants of Washington D.C. and Vicinity.
Invasive Species Management
Alexandria has rich native biodiversity, but invasive vegetation can outcompete native species and impact vegetation, pollinators, and our habitats.
Invasive Plants
Non-native invasive plants have increasingly become a major threat to natural areas, parks, forests, and wetlands by displacing native species and wildlife and significantly degrading habitats. The United States has a formal definition for invasive species:
A species that is:
1) non-native (or alien) to the ecosystem under consideration and;
2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.
See below for the non-native invasive plant control efforts throughout the City's natural areas and in the community’s backyards.
Cultural Controls
Cultural controls involve stopping invasive plants before they spread by checking clothing and equipment for plant stowaways, choosing native plants instead of non-native ones, and learning how to identify invasive species.
Mechanical Controls
Mechanical controls use manual removal of invasive plants, typically when they are small and the full root system can be taken out. Limiting soil disturbance is crucial, as invasive plants like to repopulate in disturbed soil, so consider using a tool that lift roots instead of digging.
Chemical Controls
Chemical controls involve the targeted, specific, and minimally required use of herbicide to prevent regrowth on cut tree stumps or vines, as well as foliar application. Being mindful of best practices for the safety of the environment and people is a top priority for City of Alexandria.
City of Alexandria Herbarium
An herbarium is a collection of dried plant specimens maintained for scientific reference, like a museum with fossils or a library full of historic manuscripts.
Herbaria (the plural of herbarium) can also contain reference books and photographic collections, as well as specimens of fungi, mosses, and lichens. Specimens are prepared with archival-quality materials and are intended to last for centuries.
The City of Alexandria Herbarium (AVCH) was founded to document the native and naturalized plants of Alexandria as an aid to conservation planning, but is also a reference collection for research and identification of plants of the eastern U.S., which includes native and exotic plant species and is an invaluable resource for conservation planning. The herbarium contains over 4000 specimens from over 1200 species. This research collection is a representation of Alexandria’s botanical diversity and is an important resource for research and managing natural resources.
Maintaining the City of Alexandria Herbarium
To ensure the herbarium continues to last for generations to reference, samples are collected and preserved to industry-standard conditions, based on the Smithsonian Herbarium and Kew Gardens protocols, for example. These requirements include ensuring that mounting materials are acid-free and that specimens are stored in herbarium cabinets. Temperature and humidity control, along with pest prevention, are important to make sure the herbarium can preserved and utilized for generations.
City of Alexandria Herbarium Digital Archive
The City of Alexandria Herbarium (AVCH) has been scanned digitally as part of a larger effort to digitize almost a dozen herbaria across Virginia. You can access and search this media collection on the SERNEC data portal.
Inquiry Form to Visit the Herbarium
The City of Alexandria Herbarium (AVCH) is currently housed at 2900-A Business Center Drive.
Research Requests: for scholars, botanists, and other academic research, please fill out this form for a term permit.
Educational Requests: for botanical illustrators, master naturalists, and other educational opportunities, please fill out this form for guided events.
Annals of the City of Alexandria Herbarium Archive
A 2010-2011 series featuring field botany updates, notable collections, and scientific contributions largely from the City of Alexandria, Arlington County, and Fairfax County, Virginia, as well as occasionally other locales in the Washington, D.C. area.