How Big Does An Asparagus Fern Get

An asparagus fern can get quite big, and when grown in the right conditions, it can reach up to 6 feet long as a trailing vine or 2 to 3 feet tall and wide when grown as a bushy potted plant.
 
How big an asparagus fern gets really depends on the variety you’re growing, the size of the container, and how much light and humidity it receives.
 
So if you’ve been wondering exactly how big an asparagus fern gets before you bring one home, you’re in the right place.
 
In this post, we’ll cover the different varieties of asparagus fern, how big each one typically gets indoors and outdoors, and the factors that affect the overall size of an asparagus fern.
 
Let’s dig in.
 

How Big Does an Asparagus Fern Get?

An asparagus fern gets as big as its environment allows, and different varieties reach different sizes.
 
Here’s a breakdown of what you can expect from the most common types.
 

1. Asparagus Fern (Asparagus aethiopicus)

This is the most common variety people grow indoors, and it’s the one most folks mean when they ask how big an asparagus fern gets.
 
Indoors, it usually grows 2 to 3 feet tall and spreads about 2 to 3 feet wide.
 
Outdoors in warm climates, though, this asparagus fern can get much bigger, often reaching 6 feet across as a sprawling ground cover.
 
Its cascading stems make it a favorite for hanging baskets, where the vines can trail down several feet.
 

2. Foxtail Fern (Asparagus densiflorus ‘Myersii’)

The foxtail fern has a more upright, bushy shape, so it tends to get taller than it does wide.
 
A mature foxtail fern typically reaches 2 to 3 feet tall and 3 to 4 feet wide outdoors.
 
Indoors, it usually stays smaller, around 2 feet tall, especially if it’s root-bound in a pot.
 
The plumes on this asparagus fern look like fox tails, and each one can grow up to 2 feet long.
 

3. Sprenger’s Asparagus Fern (Asparagus densiflorus ‘Sprengeri’)

Sprenger’s asparagus fern is another popular trailing type, and it can get surprisingly large.
 
Indoors, expect it to spread 2 to 3 feet wide with stems that arch and trail.
 
Outside in Zones 9 to 11, this asparagus fern can grow into a dense mound up to 2 feet tall and 4 to 6 feet wide.
 
Left unchecked, it can even become invasive in frost-free areas because it spreads so aggressively.
 

4. Ming Fern (Asparagus retrofractus)

The ming fern is a bit different because it grows more like a shrub with fluffy, cloud-like foliage.
 
It can get 2 to 3 feet tall indoors and up to 6 feet tall outdoors in ideal conditions.
 
This asparagus fern has a zigzag branching pattern that makes it look fuller as it matures.
 

What Determines How Big an Asparagus Fern Gets?

Several factors decide the final size of your asparagus fern.
 

1. Container Size

Pot size plays a huge role in how big an asparagus fern gets.
 
When the roots are confined to a small pot, the plant usually stays compact.
 
Move it into a larger container, and the asparagus fern will expand to fill the space.
 
This is why many indoor asparagus ferns stay around 2 feet, while outdoor ones in the ground get much larger.
 

2. Light Conditions

Bright, indirect light encourages strong, full growth.
 
An asparagus fern in low light will grow slowly and stay smaller, but it may also get leggy and sparse.
 
Outdoors, partial shade is ideal, since harsh afternoon sun can scorch the delicate needles.
 

3. Temperature and Climate

Asparagus ferns thrive in warm, humid environments.
 
In tropical and subtropical climates, they grow year-round and can reach their full potential size.
 
In cooler regions, they’re usually grown as houseplants or annuals, which limits how big they get.
 

4. Water and Humidity

Consistent moisture and high humidity keep an asparagus fern growing vigorously.
 
Dry air and inconsistent watering slow growth and can cause the tips to brown.
 
If you want your asparagus fern to reach its maximum size, keep the soil evenly moist and mist it regularly.
 

5. Fertilizer and Pruning

Regular feeding during the growing season pushes an asparagus fern to grow bigger and fuller.
 
Pruning, on the other hand, keeps it in check.
 
If you want a bigger asparagus fern, feed it monthly and repot as needed.
 
If you want to control its size, trim the stems and keep it slightly root-bound.
 

Can an Asparagus Fern Get Too Big?

Yes, an asparagus fern can absolutely get too big, especially outdoors in warm climates.
 
The Sprenger’s and Aethiopicus varieties are known to spread aggressively and are considered invasive in places like Florida, Hawaii, and parts of Australia.
 
Indoors, a large asparagus fern can outgrow its pot and start trailing across furniture or floors.
 
If your asparagus fern gets too big, you can divide it, repot it into a smaller container, or prune it back hard, since it tolerates heavy trimming well.
 

So, How Big Does an Asparagus Fern Get?

An asparagus fern gets as big as 2 to 3 feet indoors and up to 6 feet or more outdoors, depending on the variety and growing conditions.
 
The type you choose, the size of its pot, and how much light, warmth, and humidity it receives all shape how big an asparagus fern ultimately becomes.
 
So whether you want a compact houseplant or a sprawling outdoor beauty, now you know exactly how big an asparagus fern can get.
 
Give it the right care, and your asparagus fern will reward you with lush, feathery growth for years.