Arugula vs. Spinach: Nutrition and Health Benefits

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This arugula vs. spinach post compares these two vegetables starting with their classification and appearance or description.

 Afterward, we give you arugula vs. spinach nutrition and later the health benefits to help you decide which vegetable suits you best. However, we recommend you eat both.

What are they?

Spinach (Spinacia oleracea) is a popular leafy green vegetable that belongs to the Amaranthaceae family (the amaranth family) and genus Spinacia. Contrary to what many people assume, spinach isn’t in the cabbage family.

On the other hand, arugula or rocket (Eruca vesicaria) is also a leafy veggie belonging to the family Brassicaceae (the mustards, crucifers, or cabbage family) and genus Eruca. It is also known as garden rocket, ruchetta, eruca, rugula, ruchetta, or rucola in different parts of the world.

Arugula vs. Spinach Nutrition and Health Benefits
Arugula vs. Spinach

Both spinach and arugula are flowering dark leafy greens eaten raw as salads (alone or with other foods) or cooked, pureed, or blended in shakes. They are sold as fresh, dried, or frozen.  

You can eat spinach stems and leaves. However, as it matures and flowers, the leaves become bitter and inedible. On the other hand, you can eat arugula’s leaves, stems, seeds, and even flowers.

Both arugula and spinach are annuals. However, spinach is rarely a biennial, i.e., it can take two years to complete its life cycle.  

Finally, spinach grows best in fall, but you can also grow in late fall/early summer, while arugula best grows in spring or fall. However, you can grow these vegetables indoors in containers throughout the year.

Arugula vs spinach
Spinach vs arugula


How do you distinguish spinach from arugula? Let us look at the appearance of each of these two leafy greens.

Sizes8 to 40 inchesUp to 12 inches
StemThin single stemThick fibrous green stem (thickens as they mature)
StemIt has simple, alternating oval to rectangular green to bright green flat or crinkled leaves. The leaf size varies, i.e., 1 to 12 inches long and 0.4 to 5.9 inches wide. Typically, the leaves are more prominent towards the base.It has smaller (2-3 inches), deeply lobed (elongated with ridges) pinnate leaves with one large terminal lobe and 4 to 10 smaller lateral lobes.
FlowersSlightly larger (0.75 to 1.5 inch) flowers arranged in a corymb. The flowers have creamy white petals, purple veins, yellow stamen.Small, less conspicuous yellow-green flowers that are about 0.1 to 0.4 inches
Fruit0.5 to a 1-inch pod with an elongated apical beak.0.2–0.4 inches fruit clusters that are hard, lumpy, and dry.


Spinach has a very light, slightly sweet taste but becomes tasteless or bitter as soon as it begins flowering.

On the other hand, arugula’s taste for flavor is fresh, tart, bitter, and peppery and tends to be stronger as the plant matures. Arugula flowers and seeds have a spicy and peppery flower, with the seeds somewhat resembling the mustard flavor.

Arugula vs. spinach nutrition

Perhaps a critical consideration when you want to incorporate any food into your diet is looking at nutritional value and benefits.

Here is their nutritional composition of raw spinach and arugula per 100g (3.5 oz). Data source United States Department of Agriculture USDA,

Energy25 kcal (105kJ)23 kcal (97kJ)
Dietary sugar2.05g0.42g
Dietary fiber1.6g0.42g
Equivalent vitamin A119μg469μg
Lutein zeaxanthin3560 μg12200μg
Vitamin B1 (Thiamin)0.044mg0.078mg
Vitamin B2 (Riboflavin)0.086mg0.189mg
vitaminB3 (Niacin)0.305mg0.724mg
Vitamin B5 (Pantothenic acid)0.437mg0.065mg
Vitamin B60.073mg0.195mg
Folate (Vitamin B9)97 μg194mg
Vitamin B1200
Vitamin C15mg28.1mg
Vitamin D00
Vitamin E0.43mg2.03mg
Vitamin K109 μg483 μg
Phosphorus52 mg49mg
Potassium360 mg558mg
Sodium  27 mg79mg
Selenium0.3 µg1µg
 Oxalates24.1 ± 3.7 mg (1)913 milligrams (2)

Rich and good sources

If you consider daily percentage value (DV) and categorize a rich source as one with over 20% while a good source has 10-19%, we can conclude that:  

  • Spinach is a rich source of vitamin A including (beta-carotene and lutein zeaxanthin), folate, vitamin C and K, iron, magnesium, and manganese. It is a good source of calcium, riboflavin, vitamin B6, potassium, vitamin E.
  • On the other hand, arugula is rich in vitamin K and folate and a good source of vitamin A and C, calcium, iron, magnesium, and manganese.

Which is better? Spinach or arugula?

Considering the above nutritional value of arugula vs. spinach, it is worthwhile noting that they both have comparable amounts of water, carbohydrates, protein, calories, with arugula having a slightly dietary fiber level.

Furthermore, a side-by-side comparison reveals that spinach is higher in vitamin A, C, and K, magnesium, manganese, and iron. Also, it is higher in all other minerals except phosphorus, calcium, and pantothenic acid.

On the other hand, arugula is higher in calcium and is lower in oxalates compared to spinach.

We hope this closes the iron in arugula vs. spinach issue since clearly, spinach has more, i.e., 2.71mg, while arugula has only 1.46mg. Similarly, an analysis of potassium in arugula vs. spinach shows that spinach has more potassium than 558mg compared to arugula’s 360mg

Therefore, besides having higher oxalates and amount of calcium, spinach is nutritionally better than arugula.

Why is oxalate bad?

Oxalates will increase the risk of kidney stones, lower mineral absorption, interact with some antibiotics. Therefore, if you eat spinach, don’t mix it with other foods also higher in oxalates, such as soy products, beets, raspberry, dates, navy beans, etcetera.

Health benefits of arugula vs. spinach

Both spinach and arugula are nutritious, and they will help boost hydration. Additional health benefits are as follows:


According to US News, some of the benefits of arugula include the following.

  • Reduces cancer risk
  • Help in preventing osteoporosis
  • Lowers diabetes risks
  • Good for heart
  • Protects your heart
  • Boosts metabolism and mass muscle since it is high in sirtuins


Spinach also has several health benefits, key among, according to WebMD, are

  • Good for the eye (rich in zeaxanthin and lutein)
  • Reduces oxidative stress
  • It May help fight some cancer
  • Moderates blood pressure – has nitrates  
  • Supports brain health or cognitive function
  • Helps in osteoporosis prevention
  • Reduce anemia risks
  • Boost immunity
  • Support cardiovascular health


Since both arugula and spinach are high in vitamin K, they may alter anti-coagulating medicines like warfarin from functioning correctly.

Secondly, overeating these vegetables or any other may cause gas, bloating, and at times cramps.

Finally, spinach is high in oxalates, whose dangers we have already seen.



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