Insects Planet

Do Caterpillars Eat Grass? Nutrients, Benefits

Caterpillars are often associated with eating leaves, but what about grass? Well, as It turns out, caterpillars are very picky eaters and will usually eat specific plants. However, there are some caterpillars that will eat grass, such as the fall armyworm caterpillar.

The fall armyworm caterpillar is from the (Noctuidae) family and is the larvae of moths! They are usually spotted in late July, or early August, and primarily feed on grass.

But, why is it, that some caterpillars eat grass and others don’t? Well, all will be revealed in this article! we will also take a look at the different types of caterpillars that eat grass, and what nutrients they receive in return.

Why Do Caterpillars Eat Grass?

Well, it all depends on the variety of caterpillars. Most species will only eat specific plants in their larval state while others will eat a variety of different plants. The same goes for grass!

In fact, there are some caterpillars, that prefer finer types of grass while others will prefer coarser varieties.

However, the main reason why caterpillars eat grass, is that grass is packed with important nutrients they need in order to grow and develop, into butterflies.

(Important Nutrients That Grass Offers)

Nutrients Benefits
FiberFiber helps the caterpillar regulate its digestive system and functions, which in turn nourishes the friendly bacteria and helps promote healthy elimination of waste.
VitaminsGrass is packed with important B vitamins like B1, B2, B3, B5, B6, and B7, as well as vitamins C, E, and vitamin K. All these vitamins, release energy which is crucial for the caterpillar’s survival.
MineralsGrass also includes copper, iron, magnesium, selenium, zinc, and sulfur. And although these minerals are more for joint function, it does help with the caterpillar’s “tissue formation”.
EnzymesSome grass contains digestive enzymes that will help the caterpillar get a good amount of nutritional value from the grass, this also includes functional enzymes.
Amino acidsAmino acids are basically the building blocks of proteins, In fact, there are 22 standard amino acids. Wheatgrass for example contains 17 including 7 that are essential for the development of caterpillars.
AntioxidantsSince caterpillars are constantly shedding their skin, they are susceptible to oxidative stress. Antioxidants in the grass help them combat this stress and in return can live longer and healthier.

As you can see, grass offers a wide range of nutrients for caterpillars. Whether it be for their development or for their survival, caterpillars really do benefit from eating grass!

Related Article:

Can They Survive On A Diet Of Grass Only?

Yes, they can! grass can provide most of the essential nutrients that caterpillars need in order to survive and thrive.

They will typically eat grass in order to build up enough energy reserves so that they can make their cocoon and transform into a butterfly.

In addition, there are also certain nutrients and compounds found in grass that caterpillars rely on for other functions such as cellular repair, digestion, and detoxification.

However, it’s important to note that eating only grass does have its downsides!

For example, caterpillars are more vulnerable to predators, and since the grass needs cutting from time to time they may be at a higher risk of injury.

Do All Caterpillars Eat Grass?

There are actually a variety of different caterpillars that can eat different types of grass, depending on the species. However, not all caterpillars will feed exclusively on grass!

In fact, many other types of plants can be eaten by caterpillars as well, including leaves, flowers, fruits, seeds, and stems. Take the Swallowtail Caterpillar, for example, this one only feeds on Aristolochia plants and nothing else.

In other words, caterpillars can be quite diverse when it comes to their feeding habits, and this is partially due to the wide range of plant species that they live on.

So while some caterpillars may eat grass exclusively, others may feed on a variety of plants and consume different nutrients and compounds depending on what’s available.

What Parts Of The Grass Do Caterpillars Typically Eat?

The parts of the grass that caterpillars typically eat are usually the blades “tips” of grass. This is because these parts of the grass typically contain higher concentrations of nutrients and other compounds that caterpillars need.

Parts Of Grass Caterpillars Eat:

  • Grass Blades Or Tips
  • Grass Stalks

However, some species of caterpillar may also eat different parts of the grass depending on the season or environmental conditions.

For example, during the summer months when temperatures are high caterpillars will feed on the stalks closer to the roots where the grass is still moist.

So overall, it all depends on what type or species of caterpillar you are dealing with as well as their individual feeding habits.

But, generally speaking, most caterpillars will consume different portions or parts of grasses depending on what’s available to them.

Types Of Caterpillars That Eat Grass

There are many different types of caterpillars that eat grass, However, as before, each one feeds on a variety of species and varieties of grasses depending on their stages in development and environmental conditions.

Types Of Caterpillars That Eat Grass Include:

  • Armyworm Caterpillars
  • Sod Webworm Caterpillars
  • Woolly Bear Caterpillars
  • Knot Grass Caterpillar
  • Garden Tiger Caterpillar

So as you can see, there are a wide range of caterpillars that eat grass and other types of plants. Typically these caterpillars will eat whatever vegetation is available to them at that time.

They can also switch back and forth between different types of plants “but again” this depends on the season and environmental conditions.


At the end of the day, whether or not caterpillars eat grass really depends on what species they are and their individual feeding habits. While some caterpillars may feed exclusively on grasses, others may also consume other types of plants as well.

So if you are looking for more information about caterpillars, be sure to check out our website for tips and tricks on everything from identifying different species to controlling infestations naturally! And remember happy gardening!

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