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Agave - Black Spine

Agave macroacantha

Black Spine Agave
Agave

A compact agave from central Mexico with narrow blue-gray leaves, each ending in a glossy black spine. It slowly builds a tidy clump of small rosettes and looks more refined every year, which makes it a favorite for small gardens, planters and pots.

Small
Full sunpreferred
Ask a designer about it
Mature sizeRosettes about 1½′ tall; clumps slowly spread several feet
Growth rateSlow
Water useLow; occasional summer water
SunFull sun; light afternoon shade welcome in summer
BloomReddish-green on a stalk to about 6′, only after many years
Cold hardinessDamage possible below about 25°F
FoliageNarrow, stiff blue-gray leaves, 4–10″ long
SpinesSharp black tip spine and short black edge teeth

Living with it in the Phoenix Valley

Watering

Follow the shrub, groundcover and succulent schedule in our Landscape Care guide. It needs only a little extra water in summer and prefers rocky, fast-draining soil. Soggy ground is a bigger threat than drought.

Pruning

None needed. Each rosette dies after it flowers; cut the spent one out carefully and the pups around it fill the gap.

Cold

Leaves can be damaged below about 25°F. On a hard-freeze night, a frost cloth protects young pups and potted plants.

Heat

It handles Phoenix heat well. A little filtered shade from the west keeps the leaves at their bluest, but it is not required.

How our designers use it

Small spaces

Its modest size suits narrow side yards, rock gardens and raised planters where a large agave would overwhelm the space.

Containers

It stays in scale in a pot for years, and the black spines read clearly against a smooth, solid-colored container.

A repeated accent

Our designers like it in groups of three or five along a gravel bed, where the slowly widening clumps tie the planting together.

Good to know

Around the pool

The black tips are sharp. Keep it back from pool decking, steps and anywhere bare legs pass; a raised planter lifts the spines above foot level.

Flowering

Each rosette blooms once after many years and then dies, but the clump carries on through its pups.

Pairs well with

Similar plants

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Picturing one in your yard?

Our designers can show you where it will thrive, what to plant beneath it and how it fits the rest of your landscape.

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