Species Spotlight – Agave Plant Care

All About Growing Agave

Agave (Uh-GAH-vay) is a genus of about 200 species of succulents native primarily to Mexico and the southwestern U.S. They are found growing wild in deserts, as large ornamentals in gardens and agriculturally as a source of food, and the highly versatile sisal fibers used in making rope, paper, cloth and many products. Some agave species have very intriguing edible, imbibable properties. They are the source of a super sweet honey-substitute, and Agave tequilana is the source for Tequila. Read on to learn all about agave plant care.

About Agave

Agave shawii with fiery red spines

photo credit FarOutFlora (CC BY-NC 2.0)

This handsome, structural plant forms large rosettes with little to no stem, and a diameter that reaches from 1-20 feet. Most, like this Agave shawii, have long, sharp spines at the terminal point of each leaf, and often along their leaf margins. These spines are often a contrasting color, and when backlit by the sun, they seem to glow. Agaves make a dramatic, architectural statement in the garden. 

Agaves typically grow in shades of blue, green and silver, though some have wonderfully variegated foliage with a creamy yellow added to the color mix.  In the garden or large containers, a single agave makes a striking focal point. 

Agave Plant Care Basics

unarmed agave growing in full sun, overlooking the sea
photo credit Over Doz (CC BY-NC 2.0)

Agaves thrive in full sun, all day long. Where summer temps are extremely hot, they can tak partial shade and still perform well. Like most succulents, agaves are very drought tolerant and need gritty, fast draining soil, whether planted in the ground or in large pots. Once established, they will do well with natural rainfall. Supplement drought periods without rain by watering every 2-4 weeks. Be sure the soil dries well between waterings

Agaves will thrive despit a wide range of extremes, from scorching heat to frost, high winds, drought and nutritionally poor soils. All are perfectly adapted to a mild winter, Mediterranean climate, though some are quite cold hardy.  Agaves are incredibly easy to grow and problem free, with the exception of a single, devastating pest. More information about the agave snout weevil, and how to prevent it, below.

Spikey Agaves Are Not Cactus

closeup of variegated agave foliage with spines

Many species of agave have ferocious spikes on their leaves. They should not be planted close beside walkways, or where pets or small children are likely to play with them. Also, agaves are somewhat toxic if eaten, so take that into consideration with your pets. Agaves are not cactus, however their spikes do perform the same functions as the spines of a cactus. Agave spikes:

  • Protect the stored moisture from thirsty animals
  • Break up air flow around the plant, to prevent drying
  • Collect dew and funnel it to the plant

As agave develop, opening from a tightly furled bud, the spines of the outer leaves imprint lasting impressions on the inner leaves. These scalloped “bud imprints” can be quite decorative and intriguing.

Spineless Agave

variegated foliage of unarmed agave plant

Though most agave species do have fierce spikes, some are completely thornless. These agave varieties are said to be “unarmed”.  Interestingly, when you consider the functions performed by the thorns, unarmed agave can tolerate much more shade than the spiny varieties. 

Thornless agaves make for wonderful border plants, and are relatively safe to use near walkways. 

Agave Blooms

agave blooms on tall flower stems above the ocean

Most agaves are monocarpic, meaning they bloom just once before they die. However, they take years to mature before they do bloom, and typically form many pups at the base of the mother plant before it blooms. Only the mother plant dies after blooming, the pups continue to grow and mature for years.

Agave flower spikes are enormous, towering well above the plant, with long-lasting blooms that are highly attractive to pollinators, including butterflies, hummingbirds and bats.

Harvesting Agave

Agave tequiliana, blue agave is harvested  manually
photo credit Ted McGrath (CC BY-NC 2.0)

Several agave species are grown as agricultural crops for several uses. Agave tequilana, the blue agave, is the source of tequila. Several species produce a super sweet nectar marketed as a substitute for sugar and honey safe for diabetics. While agave plantations are large and modern, the plants are still harvested by hand, by growers who have passed the knowlege of the plants down through generations.

Cold Hardy Agave Plants

Agave victoriae-reginae (Queen Victoria Agave)

Although most agaves won’t tolerate a hard freeze without damage, some, like the lovely Agave victoria-reginae are exceptionally cold hardy and thrive despite winter snow and sleet.  The Queen Victoria agave is also an excellent choice for containers. It grows just 18″ in diameter, with fetching white stripes down the smooth leaf margins and small terminal spines. 

Agave Snout Weevil 

blue green variegated agave, closeup

The agave snout weevil is a nasty, little black beetle just 1/2 inch long that can take out a mature agave the size of a VW bus. These are slow-moving pests that thankfully cannot fly. But they are hard to see on your plants because they hide in the soil and between the leaves at the base of the plant. Often, your first indication that you have snout weevil is the complete collapse of your beautiful plants.  

The most likely way for snout weevils to enter your garden is in the soil or the leaves of a new agave plant. Take the time and care to closely inspect any agave before you plant it. Remove all the soil from the roots, and carefully wash the roots in a tub before planting. That way, any grubs or adult weevils will wall into the tub, rather than your garden soil or container. Then, carefully look at the base of the leaves and between the leaves for any sign of penetration. Remove and destroy any larva or beetle you find.

Some agave species are highly resistant to the dreaded snout weevil, including Agave attenuata, Agave bracteosa, Agave ‘Skarkskin‘, Agave filifera and the lovely Agave victoria-reginae described above.

Preventing Agave Snout Weevil

Prevention is the key to protecting you agave from snout weevil damage. Always inspect new plants as described above. And take action now, today to protect any agave you own.

To protect your agave plant, and to prevent snout weevils from moving in, apply a generous top-dressing of worm castings. This organic fertilizer provides vital micronutrients to your plants, but more importantly, infuses them with chitinase, an enzyme that breaks down the insects’ exoskeleton.  Worm castings are an excellent fertilizer and insect repellant for all your succulents. Don’t wait for signs of agave snout weevil on your established before adding worm castings. Once you see weevil damage, it is likely too late to save that plant.

Apply a half-inch layer of worm castings on top of the soil around every healthy agave you own, in the ground or in containers. Cover the worm castings with an inorganic mulch like pea gravel to keep it in place. Every time it rains or you add water, your plant will take in the worm castings. The chitinase infuses the plant until it is carried to every cell. Any insect feeding off the plant will die. Insects can smell the chitinase and will refuse to even land on a plant protected by worm castings.

colorful leaves in agave plant

Agaves are magnificent, east to grow succulents that make an architectural statement in your garden. Choose your agave to suit your climate. Examine it carefully, then plant and enjoy the drama for years of carefree beauty.

If you have any questions about growing agave, please leave a comment. I’ll be happy to answer it. Please note, there will not be a new succulent post until Tuesday, January 8th. I’ll miss you! Have a wonderful holiday, and I’ll see you in the New Year!

P.S. For more succulent care information, please subscribe to The Succulent Eclectic! You’ll receive my free e-course 7 Steps to Succulent Success!

All about growing agaves and how to protect them from snout weevil
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4 thoughts on “Species Spotlight – Agave Plant Care”

  1. Hi Kat!

    In the section entitled ‘Preventing Agave Snout Weevil,’ you write, “If your agave are infested with snout weevil, it will be too late to use worm castings. Instead, apply a half-inch layer of worm castings . . .”

    Kat, I’m confused. If it’s too late to apply worm castings, then why am I applying worm castings? Is to prevent the weevils from spreading to other agaves?

    Thanks!

    1. Hi Linda,
      Thanks for the chance to clarify – I’d better re-write that. My point is that you must not wait for an infestation of snout weevils before protecting your agave. It is likely too late by the point you know you have them. Instead, wash the soil from the roots and inspect the plants to remove any chance of grubs or weevils. Then plant them and apply a top dressing of worm castings to prevent the arrival of the weevils. If you have agave growing now, don’t wait for signs of trouble before adding worm castings – protect them now.
      Thanks for the question!
      ~Kat

      1. Great! Makes perfect sense now. You do a great job, Kat. I’m so glad to have found your website. Thanks and have a good holiday!

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