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Agave havardiana (Harvard Agave)

Harvard Agave, Harvard's Century Plant

Agave havardiana, Harvard Agave, Harvard Century Plant, Blue agave, Gray Agave, Drought tolerant plant, Cold hardy agave, Hardy agave

Extremely cold-hardy, Agave havardiana (Havard Agave) is an evergreen, perennial succulent forming a tight rosette of fleshy, broad, cupped, silver-gray leaves. Adding an attractive texture and interest year-round, the leaves are heavily lined with dark brown teeth along their margins and tipped with a wickedly sharp black terminal spine. Mature plants (over 10 years) flower only once. They are topped with magnificent flowering spikes that can reach 10 ft. (3m), and bear clusters of fragrant golden flowers, which are attractive to hummingbirds. The flowering rosette dies after flowering. While this Agave is usually solitary, it may produce offsets.

  • Grows up to 2-3 ft. tall (60-90 cm) and 3-4 ft. wide (90-120 cm). May reach 10 ft. (3 m) with flower stalk. 
  • Easily grown in well-drained soils in full sun. Drought tolerant once established. Little to no supplemental irrigation is required. This species is far more tolerant of cold and wet than most species and can often be grown outside in the full sun in sharply drained, stony, or sandy, dry soil.
  • Great for coastal gardens, city gardens, rock gardens, succulent gardens, or Mediterranean gardens. Ideal as an accent plant in sunny borders or in decorative containers.
  • Plant away from foot traffic: the needle-sharp spines on the leaf tips can be a hazard to humans and pets. Don’t plant this Agave near paths or walkways
  • Attracts hummingbirds and birds but is deer resistant
  • Virtually disease free. Watch for scale insects.
  • Propagate by seed in early spring, or by division of offsets in spring or autumn
  • Use caution, safety glasses, long sleeves, long pants, well-covered shoes, and gloves when cutting this plant.
  • Native to SW Texas to Mexico

Agave: Plant Care and Growing Guide


Agave plants are popular for landscaping because they are rich in many qualities and have a striking architectural appearance. Here are some tips on how to plant and grow agaves successfully

Requirements

Hardiness 5 - 10
Climate Zones 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Cactus & Succulents
Plant Family Asparagaceae
Genus Agave
Common names Agave
Exposure Full Sun
Season of Interest Spring (Early, Mid, Late)
Summer (Early, Mid, Late)
Fall
Winter
Height 2' - 3'
(60cm - 90cm)
Spread 3' - 4'
(90cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, Southwest, Texas
Tolerance Drought, Deer, Dry Soil, Rocky Soil
Attracts Birds, Butterflies, Hummingbirds
Garden Uses Beds And Borders, Patio And Containers
Garden Styles Gravel and Rock Garden, Coastal Garden, City and Courtyard, Mediterranean Garden
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Alternative Plants to Consider

Agave tequilana (Blue Agave)
Agave angustifolia var. marginata (Caribbean Agave)
Agave xylonacantha (Saw Leaf Agave)
Agave x leopoldii (Leopold Agave)
Agave vilmoriniana ‘Stained Glass’ (Octopus Agave)
Agave macroacantha (Black-Spined Agave)

Recommended Companion Plants

Senecio mandraliscae (Blue Chalksticks)
Sedum nussbaumerianum (Stonecrop)
Eschscholzia californica (California Poppy)
Festuca glauca ‘Elijah Blue’ (Blue Fescue)

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Agave: Plant Care and Growing Guide
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 5 - 10
Climate Zones 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Cactus & Succulents
Plant Family Asparagaceae
Genus Agave
Common names Agave
Exposure Full Sun
Season of Interest Spring (Early, Mid, Late)
Summer (Early, Mid, Late)
Fall
Winter
Height 2' - 3'
(60cm - 90cm)
Spread 3' - 4'
(90cm - 120cm)
Spacing 48" (120cm)
Maintenance Low
Water Needs Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Native Plants United States, Southwest, Texas
Tolerance Drought, Deer, Dry Soil, Rocky Soil
Attracts Birds, Butterflies, Hummingbirds
Garden Uses Beds And Borders, Patio And Containers
Garden Styles Gravel and Rock Garden, Coastal Garden, City and Courtyard, Mediterranean Garden
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Agave
Guides with
Agave
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