Growing Agave in Annapolis and the Mid-Atlantic: What Works

"Agave annapolis" is not a species. There is no Agave annapolis in the botanical literature, and any plant sold under that name is either mislabelled or being marketed under a location-based trade name. The original meaning of the phrase in popular writing refers to agave grown in and around Annapolis, Maryland, where the Chesapeake Bay climate occupies the warmer edge of USDA zone 7b.

Because the question is real even if the species is not, this page covers what actually grows there.

Part of the Complete Agave Guide.

Climate context

Annapolis sits at about 39° N latitude in a humid-continental to humid-subtropical transition zone. Winters bring extended cold with typical minima of −10 °C to −12 °C, humid summers above 30 °C, and roughly 1,100 mm of annual rainfall distributed through all seasons. The combination of winter cold, winter wetness, and humid summers is a difficult one for a genus adapted to the dry uplands of northern Mexico and the US Southwest.

The load-bearing variable is not cold tolerance on paper but winter wetness in the root zone. Most agave deaths in the Mid-Atlantic come from crown rot in saturated soil near freezing, not from cold itself.

Species that work

Only a handful of agaves are reliable outdoors in a zone 7 climate:

• Agave parryi (Parry's agave). The default choice. Survives routine winters at −15 °C when dry, and the Huachuca variety A. parryi var. huachucensis is particularly forgiving of moisture. See Agave parryi.
• Agave havardiana (Havard's agave). Close relative of A. parryi, slightly larger and arguably more winter-wet tolerant.
• Agave montana. High-elevation Mexican species, a strong performer in wetter cold climates.
• Agave ovatifolia ('whale's tongue' agave). Broad glaucous leaves, tolerates winter wet better than most, reliable in zone 7b with sharp drainage.
• Agave neomexicana. Smaller and very cold hardy.

Species that do not work outdoors in Annapolis include A. americana (foliage damaged most winters), A. tequilana (killed by the first hard freeze), A. attenuata (dies at 0 °C), and A. victoriae-reginae (hardy enough in dry cold but unreliable with the winter wetness). These must be grown in containers and overwintered indoors or in a cold greenhouse.

Siting

Three factors determine outdoor survival:

• Drainage. Plant on a raised mound or slope, not in flat ground. Amend the native soil with 60% or more coarse mineral grit to a depth of 40 cm. Avoid overhangs and gutters that concentrate winter runoff over the root zone.
• Winter sun exposure. South or southwest aspect. Winter sun dries the substrate and warms the crown through the coldest stretches.
• Airflow. Open sites with free air movement dry faster after rain or snow, which reduces fungal pressure on the leaves.

A gravel mulch 5 cm to 8 cm deep around the crown reduces soil splash and helps the substrate dry faster after rain.

Winter protection

In exceptional cold events below −18 °C, a temporary cover of fleece or a plastic cloche over the crown (not the whole plant) reduces damage. Remove covers as soon as temperatures recover; sustained cover in humid conditions invites rot.

Do not water outdoor agaves in Annapolis from October through April. Any supplemental winter water is a net negative for survival.

Indoor and container cultivation

For the species that will not survive outdoors, conventional container culture works. Use a mineral-heavy substrate (see the pillar guide), site in the brightest window available (south-facing), and water only when the substrate is fully dry. An unheated porch or garage at 5 °C to 10 °C makes an acceptable winter dormancy space.

Agave syrup

A secondary meaning of "agave Annapolis" in popular writing refers to agave nectar as a sweetener rather than the living plant. That is a food-industry topic outside the scope of a cultivation guide; the syrup is industrially processed from the hearts of A. tequilana and A. salmiana in Mexico, not from any plant grown in Maryland.

See also: Agave parryi, Agave victoriae-reginae, Agave americana.