Agave filifera (Thread Leaf Agave)

Agave filifera

Last updated on June 21st, 2022 at 04:12 am

The Agave filifera, also known as the thread agave or thread leaf agave, is one of the many species of agave you can add to your collection. It’s beautiful and quite unique in comparison to other agaves, so if you’re looking for something different than the ordinary blue or rosette agave, it’s a good choice!

It takes some extra special care and attention to keep an Agave filifera happy indoors, but it’s worth it for the pretty leaves and big flowers.

Thread agave is also known as the Spanish bayonet or thread leaf agave, and they are not at all related to the blue agaves that are frequently used in tequila production.

This plant, which comes from Mexico, has long and slender leaves that look like they’ve been threaded onto their stems, hence the name thread leaf agave. The leaves can reach up to two feet in length but generally average about one foot.

Origin and distribution

The Thread Agave (Agave filifera) plant is native to Mexico, but it is popular among gardeners all over the world because of its unique leaf structure and beautiful flowers that bloom in the summertime.

In its natural habitat, it grows best in sandy soil and light shade under trees, but as an indoor plant, it also thrives when given proper care and attention from its owner.

These succulents thrive in elevations between 1,500 and 3,000 feet. One of these species, Agave filifera , is commonly cultivated as an ornamental plant. It’s also called thread-leaf agave due to its long stalks of needlelike leaves extending from its rosette center.

In some cases, gardeners may even find that their plants send up a flower stalk; however, it will quickly die back after blooming. The most common cultivar of Agave filifera is Variegata or Variegated Mexican Agave.

In addition to its distinctive leaf patterning, Variegata has variegated edges on its broad green leaves that give it a delicate appearance.

Agave filifera propagation

Agave filifera

Agave filifera can be propagated in one of three ways. The first is through seeds, which will take a long time to reach maturity.

The second way is through leaf cuttings, which also have a very slow growth rate and are not widely used.

And finally, there are offsets, called pups or suckers, that develop at intervals around its base; these pups can be separated from the parent and transplanted into another pot to grow on their own.

Agave montana (Mountain Agave Plant)

This last method is by far the most common and easiest. All you need to do is locate an offset and pull it off, then transplant it into a new container with fresh soil.

Agave filifera care information

Agave filifera

Many desert enthusiasts are familiar with agaves and their ability to survive extreme temperatures, but they may not know that not all agaves are hardy in harsh weather.

Agave filifera is an exceptionally cold-hardy variety of agave that is able to stand up to light freezes, which makes it a great choice for colder climates. The plant requires little care once planted and is often described as self-sufficient because it grows in many well-drained soils.

Light requirement

Agave filifera likes bright light. Keep it in a sunny window and be sure to protect it from intense midday sun. If you have high, unobstructed windows, place your agave on a desk or table and enjoy its appearance as an exotic houseplant.

Make sure that you do not position your agave in front of the glass because it does not like reflected heat from glass.

Soil/potting mix

Since Agave filifera are succulents, they like soil that is well-draining. A cactus potting mix would be ideal, but you can also add organic material to a regular potting mix to make it more well-draining. Be sure to add in lots of organic material, the idea is that you want your soil/potting mix to be similar in texture and moisture retention to a sponge.

The perfect soil will hold water for weeks or even months without drying out completely. If your plant’s roots sit in wet soil for too long, they’ll rot and kill your plant.

To test if your soil has good drainage, stick a finger into it; if it feels wet after 15 seconds or so, then you need to add more organic material until it doesn’t feel wet anymore when you poke at it with a finger.


Allow soil to dry about halfway between waterings. Watering well in spring and summer, then allowing the soil to dry slightly before watering again will produce a happy agave! Filiferas have been known to go several months without water once established in a pot.

Agave celsii (Agave mitis)

When possible, it’s best to soak a pot of agave at least every three days, more often if warm weather prevails. This should be done early in the morning so that moisture can evaporate throughout the day. If you are unable to do so, place your plant outdoors for several hours each day or use a saucer under your plant for catching rainwater.

Do not allow plants to sit in saucers filled with water as they may rot from being too wet.

Remember that plants grown indoors require regular watering; however, since most indoor spaces are not heated during winter months, you may need to reduce the frequency of watering during cooler times of the year.


Applying fertilizer to Agave filifera is not required but will promote growth. Mix 1/4 cup of 20-20-20 with 1 gallon of water and pour around the soil. Fertilize every 4–6 months with a balanced fertilizer at 1⁄4 strength for houseplants.

Do not over-fertilize as it can burn your plant and leave spots on its leaves. Repotting: Thread agaves do well in small pots until they are ready to be planted in gardens.


While many succulents can tolerate temps below freezing, Agave filifera can’t. They should be kept above 50 degrees F. But don’t worry; they may look delicate, but they can handle a wide variety of temperatures without much trouble.

On average, your thread agave will thrive in temperatures between 65 and 85 degrees F with little seasonal variation.

High temperatures will quickly kill an agave, so keep it away from radiators and space heaters.


Agave filifera needs sufficient humidity for healthy growth, but excessive humidity is detrimental to their health. Thread leaf agaves do best with 50-60% relative humidity. Keep in mind that the amount of water evaporating from a plant’s leaves is related to its size, which can vary significantly between species.

Hence, since thread leaf agaves are much smaller than other types of agaves, they require lower levels of relative humidity. In general, low-light environments will have higher relative humidities than well-lit spaces.


The most important maintenance task to keep your Agave filifera healthy is pruning. Prune your plant back hard in late winter or early spring when it has finished its current season of growth and it begins to look straggly. Pruning will also promote new growth at the desired location, which can be great for filling out a spot where you want more height or width, but not length.

Agave potatorum (Butterfly Agave Care)

The reason to prune back hard is that agaves have a distinct growing pattern in their lifetime. They begin with a rosette of leaves from which they send up a tall stalk. At some point, depending on how much light they receive, they stop sending up stalks and instead form pups around themselves called offsets.

If left unpruned, these offsets will eventually fall over because there isn’t enough support as they get bigger.

When to repot

Agave filifera

Repot your Agave filifera in spring as new leaves appear. Be sure to use a pot with adequate drainage to accommodate its long taproot, or consider purchasing a self-watering container.

Keeping agaves too moist is one of their biggest downfalls: they tend to rot when exposed to even light levels of moisture for long periods of time. In humid climates, it may be necessary to repot every year and grow in a greenhouse or outdoors in full sun.

Dormancy/Winter rest

This is a tricky one, as not all thread leaf agaves require dormancy to survive. Forcing an agave to go dormant will usually result in its demise. However, if your plant does need it – make sure it is in a well-lit room with temperatures around 68 degrees fahrenheit.

This can be accomplished by setting up shop near a window or even placing your plant on top of a refrigerator or other heat source that gives off some warmth while still maintaining moderate temperatures. Once you have found your ideal location for your agave, place a small amount of water in its pot so that it never dries out completely.

If you are unsure whether or not your plant needs dormancy, consult an expert before doing anything drastic.

Agave filifera flower & fragrance

The flowers of Agave filifera have become famous for their vibrant color and intoxicating fragrance. Though each agave species has its own distinctive scent, Agave filifera blooms are often described as sweet and spicy with a slight hint of vanilla.

The fragrance can be used in different ways to transform your home and garden into a fragrant paradise.

Growth rate

Thread agaves grow at a relatively fast rate. You can expect your agave to be 3 feet tall after its first year, 6 feet after its second, and 10 to 15 feet by its fifth year.

Agave shawii (Shaw's Agave Plant)

At maturity, typically at around 8 to 15 years old, you’ll have a plant that is 3 to 4 feet in diameter with an equally as wide spread of leaves. While mature thread agaves may eventually grow taller than 20 feet, most people find them more aesthetically pleasing if they are kept shorter.


Agave filifera is toxic to humans and pets. Caution should be used in cases of allergies. Avoid skin contact with the sap, which can cause irritation. If ingested, seek medical attention right away. Avoid contact with eyes, nose, and mouth. Wash thoroughly after handling to prevent eye and skin irritation.

USDA hardiness zones

Agave filifera thrives best in USDA hardiness zones 9 and 10. In zone 9, it can survive outdoors year-round, but it will need to be protected from freezing temperatures. In zone 10, it will grow year-round outdoors.

It does not tolerate frost well at all and will die if exposed to below-freezing temperatures for long periods of time. If you live in a colder climate, you can grow an agave indoors or purchase one that is already grown and bring it inside during the winter months.

Pests and diseases

Growing Agave filifera in most parts of Texas is easy, but you’ll have to keep an eye out for pests and diseases. Thread-leaf agaves are commonly bothered by mealybugs, spider mites, aphids, and scales.

To protect your plants from pests and diseases, use organic methods as much as possible, such as releasing beneficial insects into your garden to eat harmful bugs. To repel ants and other crawling insects that feast on sap, spread products made with diatomaceous earth around your plants.


The thread leaf agave is a great plant for those wanting to add a little something different to their home and garden. Because it has such a unique form and color, it also adds visual interest wherever it’s placed. If you’re looking for something unusual but also very beautiful, consider planting one of these in your yard or even in your home.