I have updated my list of garden centers and nurseries in the Washington DC metro area. If I missed one, please let me know.
Maryland
Ace Hardware stores in MD, check website to see which sell plants, http://www.acehardwaredc.com
American Plant
5258 River Road, Bethesda, MD (301) 656-3311
7405 River Road, Bethesda, MD (301) 469-7690
http://www.americanplant.net
Chesapeake Natives
9640 Rosaryville Road
Upper Marlboro, MD
by appointment only or at select times, check website
http://www.chesapeakenatives.org
Country Nursery
3330 Spencerville Road, Burtonsville, MD (301) 471-9593
http://www.countrynurserylandscape.com
Denchfield Nursery and Garden Center
5950 Ager Road, Hyattsville (301) 949-5000
http://www.dlandscaping.com
Fehr Nursery
4340 Sandy Spring Road
Burtonsville, MD (301) 384-5222
http://www.fehrnursery.com
Gambrills Flower Farm
800 Annapolis Road, Gambrills, MD (443) 292-6999
http://www.gambrillsflowerfarm.com
Greenstreet Gardens
1721 West Braddock Road, Alexandria, VA (703) 998-3030
5905 Richmond Highway, Alexandria, VA (no phone)
391 West Bay Front Road, Lothian, MD (410) 867-9500
http://greenstreetgardens.com
Grey Goose Farms, 5539 Olney-Laytonsville Road, Laytonsville, MD (301) 977-7555
http://www.greygoosefarm.com
Homestead Gardens
743 W. Central Avenue, Davidsonville, MD (410) 798-5000
522 Ritchie Highway, Severna Park, MD (410) 384-7966
http://www.homesteadgardens.com
Johnson’s Florist and Garden Centers;
5011 Olney-Laytonsville Road, Olney, MD (301) 987-1940
10313 Kensington Parkway, Kensington, MD (301) 946-6700
http://www.johnsonsflorists.com
Meadows Farms
Over 20 locations in Maryland & Virginia, check web site or call headquarters
(703) 327-3940
http://www.meadowsfarms.com
Patuxent Nurseries
2410 North Crain Highway, Bowie, MD (301) 218-4769
http://www.patuxentnursery.com
Potomac Garden Center
12024 Darnestown Road, Potomac, MD (301) 948-8890
8710 Fingerboard Road, Urbana, MD (301) 874-3400
http://www.potomacgardencenter.com
Putnam Hill Nursery, 2105 Putnam Road, Forest Hill, MD (443) 722-2012
http://www.putnamhillnursery.com
Stadler Nurseries
6815 Olney-Laytonsville Road, Laytonsville, MD (301) 944-1190
5504 Mt. Zion Road, Frederick, MD (301) 473-9042
10200 Stadler Place, Bristow, VA (703) 257-2800
http://www.stadlergardencenters.com
Sun Nurseries
14790 Bushy Park Road, Woodbine, MD (410) 442-2090 or (301) 854-6107
http://www.sunnurseries.com
Susanna Farm Nursery, 17700 White Ground Road, Boyds MD (301) 972-7513
http://www.susannafarmnursery.com
Thanksgiving Farms, 1619 Buckeystown Road, Adamstown, MD (301) 662-1291
http://www.thanksgivingfarmandgarden.com
Virginia
Ace Hardware stores in VA, check website to see which sell plants, http://www.acehardwaredc.com
Abernethy and Spencer Greenhouse and Garden Center, 18035 Lincoln Road, Purcellville, VA (540) 338-9118
http://www.abernethyspencer.com
Betty’s Azalea Ranch
12507 Lee Highway, Fairfax, VA (703) 830-8687
http://www.bettysazalearanch.com
Burke Nursery & Garden Centre
9401 Burke Road, Burke, VA (703) 323-1188
http://www.burkenursery.com
Campbell & Ferrara
8351 Richmond Highway, Alexandria, VA (703) 354-6724
http://www.campbellferrara.com
DeBaggio’s Herb Farm and Nursery, 43494 Mountain View Drive, Chantilly (703) 327-6976
http://www.debaggioherbs.com
Greenstreet Gardens
1721 West Braddock Road, Alexandria, VA (703) 998-3030
5905 Richmond Highway, Alexandria, VA (no phone)
391 West Bay Front Road, Lothian, MD (410) 867-9500
http://greenstreetgardens.com
Heather Hill Gardens, 811 Ox Road, Fairfax Station, VA (703) 690-6060
http://www.heatherhillgardens.com
Holly, Woods and Vines
8453 Richmond Highway, Alexandria, VA (703) 799-1607
http://www.hollywoodsandvines.com
Hybla Valley Nursery, 2801 Beacon Hill Road, Alexandria, VA (703) 768-1100
http://www.hyblanursery.com
Lake Ridge Nursery and Garden Center
3705 Old Bridge Road
Woodbridge, VA (703) 590-0178
http://www.lakeridgenursery.net
Meadows Farms
Over 20 locations in Maryland & Virginia, check web site or call headquarters for closest one (703) 327-3940
http://www.meadowsfarms.com
Merrifield Garden Center
8132 Lee Highway, Merrifield, VA (703) 560-6222
12101 Lee Highway, Fairfax, VA (703) 968-9600
6895 Wellington Road, Gainesville, VA (703) 368-1919
http://www.merrifieldgardencenter.com
Nalls Produce, 7310 Beulah Street, Franconia, VA (703) 971-4068
http://www.nallsproduce.com
Silverbrook Nursery and Landscaping
8408 Monacan Road, Lorton, VA (703) 690-1231
http://www.silverbrooknursery.com
Stadler Nurseries
6815 Olney-Laytonsville Road, Laytonsville, MD (301) 944-1190
5504 Mt. Zion Road, Frederick, MD (301) 473-9042
10200 Stadler Place, Bristow, VA (703) 257-2800
http://www.stadlergardencenters.com
Wolf Trap Nursery, 9439 Leesburg Pike, Vienna, VA (703) 759-4244
http://www.wolftrapnursery.com
Washington, DC
Ace Hardware stores in DC, check website to see which sell plants, http://www.acehardwaredc.com
Ginkgo Gardens
911 11th Street, Washington, DC SE (202) 543-5172
http://www.ginkgogardens.com
Little Leaf Shop (houseplants)
Logan Circle, 1401 S Street, NW Washington DC (202) 506-2131 and pop up shop at Union Market, 1309 5th Street NE Washington DC
http://www.littleleafshop.com
Urban Jungle (houseplants, orchids, succulents)
2603 Sherman Avenue, NW Washington DC (202) 740-8483
http://www.urbanjungledc.com
Thanksgiving Farms near Frederick, MD is a great source for new and unusual plants. http://thanksgivingfarmandgarden.com/
Thanks for letting me know, I will add it to the list.
Holly, Woods and Vines https://hollywoodsandvines.com/
Grey Goose Farm. Randy from Behnke Nurseries is there. Say Hi! https://greygoosefarm.com/
Putnam Hill is worth the trip! https://putnamhillnursery.com/about-us/visit/
Thanks for letting me know, I will add to the list.
Abernathy and Spenser in Purcellville VA is fabulous!
Thank you, I will add it, never heard of it before but looks great online!