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Water spinach has long been one of my favorite vegetables since I was a child. Spinach and water spinach both have the word “spinach” in them, so many people assume they are the same. I was wondering if this is the case too. Here’s what I found.
Despite sharing the same name, water spinach or kangkong and spinach belong to two different families. Water spinach is part of the Morning Glory family, which is closely related to sweet potato, whereas spinach belongs to the family Chenopodiaceae, which includes plants that have no petals, such as beets.
Read on to know more about the differences between water spinach and spinach.
- What is water spinach and spinach?
- Water spinach vs spinach: What are their key differences?
- Water spinach benefits
- Water spinach or kangkong side effect
- Water spinach recipe
- Related Questions
What is water spinach and spinach?
Water spinach, with its scientific name, Ipomoea aquatica, is known by many other common names in different countries, such as kangkong, swamp morning glory, and Ong Choy.
Water spinach is an aquatic vine that can grow up to 9ft long with hollow stems and has flowers that look like morning glory.
On the other hand, spinach, or scientifically known as Spinacia oleracea, is an annual plant that has a dark green, heavy rosette of broad, spoon-shaped, and tender leaves.
It is a well-known strength booster vegetable that is popularized by the cartoon show, “Popeye the Sailor”.
Water spinach and spinach are both edible leafy vegetables with a lot of health benefits.
Even though they share the same name, both are entirely different vegetables with different needs, looks, and tastes.
Water spinach vs spinach: What are their key differences?
Here’s a table showing the main differences between water spinach and spinach:
Water spinach, swamp cabbage, water morning glory, water convolvulus, kangkong
Cool and cold
Hot and sunny
Raw or cooked
Raw or cooked
As I’ve mentioned above, water spinach or Ipomoea aquatica is a part of the Convolvulaceae (Morning glory) family, which shares the same genus as the sweet potato and beet.
In contrast, spinach or Spinacia oleracea is an edible flowering plant that belongs to the family Chenopodiaceae, which is related to Swiss chard and beets.
According to World Crops, water spinach or kangkong has two major varieties:
- Green stem water spinach: Also known as Ching Quat, this water spinach has white flowers and narrow leave and typically grown in moist soils.
- White stem water spinach: Also known as Pak Quat, the leaves of this water spinach variety are arrow-shaped. It has pink flowers and grown in an aquatic environment.
On the other hand, regular spinach has three major varieties: savoy leaf, smooth leaf, and semi-savoy.
- Savoy leaf: This type of spinach has crinkly and curly leaves. They kept fresh for longer and have more eye-catching features and hence are most commonly grown for local markets. Examples of popular savoy spinach are Harmony, Avon, and Bloomsdale.
- Smooth or flat-leafed: This type of spinach has flat smooth leaves. Compared to the savoy leaf spinach, they are easier to clean and have a higher yield. However, they do not keep fresh for long and hence are usually canned and frozen. Examples of popular smooth or flat-leafed spinach include Space, Bordeaux, and Red Kitten.
- Semi-savoy: This type of spinach has semi-crinkly leaves but is easier to clean than the savoy spinach. It is usually sold fresh in the market. Examples of semi-savoy spinach include Melody, Tyee, and Indian Summer.
Habitat and growth habit
Traditionally, water spinach was grown either on river banks or in swamps.
However, recently, they are also grown on land in the garden, resulting in two different forms of growing habit: soil and swamp.
Water spinach that grows on land or soil needs plenty of water and will grow tall and their long shoot will trail over the ground.
On the other hand, the water spinach that grows in the swamp is a semi-aqueous plant that grows along the ground. This type of water spinach is called swamp cabbage.
Water spinach can also invade moist cultivated areas and wet areas such as rice or sugar cane fields and drainage canals.
Tough water spinach is a creeping vine, it may grow erect in water.
Spinach grows on land and can be planted on a variety of soils. But it grows best and most quickly in well-drained soil that is rich in organic matter with high pH (6.5 to 7).
Peat soils can also be used to get the highest yields.
Climate and temperature
Generally, water spinach loves “sunny” while spinach loves the “cold”.
This means that the water spinach prefers to grow in an environment of sunny and hot climate while spinach loves to grow in the cold climate.
Water spinach cannot stand the cold and needs plenty of sunshine. Seeds that are planted in low-temperature soil will not germinate.
The optimal temperatures of growth for water spinach are between 75°F and 85° F (around 24℃ to 29℃) and chilling injury can happen if the temperature is below 50° F (10℃).
That is why if you want to grow water spinach, the best time to sow the seeds would be when the weather is hot. This is around late spring through the entire summer.
As for spinach, it prefers cold weather and is sensitive to excessive heat.
The optimum temperature for spinach seed germination is around 7℃ to 24℃.
Young spinach can even withstand temperatures as low as -9 C!
Water spinach has a very mild sweet taste.
Young water spinach shoots and leaves are sweeter and texturally more tender than the matured ones. It can be eaten raw as a salad or cooked in a number of dishes.
Spinach, on the other hand, produces different tastes depending on how you prepare them.
When eaten raw as a salad, spinach will give you a light and green taste.
When cooked, spinach tends to give you a bitter taste and becomes a bit slimy if you overcook it.
However, leaves of baby spinach are tender and slightly sweet and are much less likely to give a bitter taste when cooked.
You can reduce the bitterness of spinach by adding other ingredients such as using milk to combat the taste.
You can also try to boil or steam the spinach to get rid of the bitterness.
If you want to learn more about how to reduce the bitterness of spinach, try following these tips.
Don’t know how to prepare your spinach? Grab this superfood cookbook on Amazon that contains 50 tasty spinach recipes!
Water spinach vs spinach nutritional profiles
2. 86 g
*raw, 100 g
Source: USDA National Nutrient Database
In addition to carbs, protein, and fiber, spinach is an excellent source of antioxidants and contains vitamin A, vitamin C, calcium, iron, folic acid, and has more beta-carotene than broccoli (up to 4 times).
Water spinach benefits
Similar to all other dark green leafy vegetables, water spinach is rich in nutrients. It is an excellent source of protein, fiber, vitamin A and C, iron and calcium.
Here are some health benefits of water spinach or kangkong:
- Lower cholesterol level: A study conducted on rats found that water spinach consumption help lowers cholesterol and triglyceride levels.
- Treatment for liver and jaundice: Ayurvedic medicine has been using water spinach for treating liver and jaundice problems. Research shows that this vegetable’s extract can protect against chemical-induced liver damage because of its detoxification enzymes’ modulation, antioxidant and free radical scavenger effects.
- Help in treating anemia: Young water spinach is loaded with iron, making it beneficial for anemic people and pregnant women that need to include iron in their diets. Iron is vital for the production of hemoglobin.
- Help treat constipation and indigestion: Water spinach has a high fiber content, which helps in digestion and alleviates various digestive issues. Boiled spinach juice helps relieve constipation.
- Help prevent diabetic: Researchers found that regular consumption of this vegetable helps develop resistance against diabetes-induced oxidative stress. It is also used to treat diabetes in pregnant women.
Water spinach or kangkong side effect
Water spinach or kangkong is generally considered safe for consumption in food quantity.
However, since it is hard to know the sanitary conditions of the water where it grew, it is better to eat it after washing and cooking it properly.
You get infected by this parasite when you accidentally eat its larval cysts, which were laid on the water spinach.
The cysts will develop into a fluke that attaches itself to the intestinal wall of humans and pigs, leading to indigestion, abdominal pain and allergic reactions.
Untreated cases may be deadly.
Hence, if you want to eat water spinach, be sure to boil or fry it properly first before serving it.
Water spinach recipe
You can enjoy water spinach in many ways. My favorite way to cook them is by stir-frying them.
Here’s a water spinach recipe video teaching you how to make water spinach stir fry quickly and easily.
Things to keep in mind when preparing the water spinach:
- Wash the water spinach thoroughly to make sure no dirt or sand is left trapped on the leaves or stalks. I usually soak them in a bowl of water with salt for a few minutes before rinsing them under running water.
- The first few inches of the stalks are fibrous and hard to chew, so you should cut them off.
- Since the upper half of the stalks and the leaves are softer and thinner, they tend to cook faster than the lower half of the stalks, so you should separate them when cooking. I usually let the lower half cook first before adding in the upper stalks and leaves.
Is water spinach illegal?
Water spinach (Ipomoea aquatica) is listed as a Federal Noxious Weed under the Plant Protection Act by the United States federal government, This makes water spinach illegal to possess and be imported or transported between states in the U.S without a special permit.