The Ultimate Guide on How to Freeze Bok Choy

Vegetables like bok choy play an essential role in the human diet. However, bok choy is very difficult to preserve due to the high amount of water in the cell, which is a favorable environment for microorganisms to grow.

So can you freeze Bok Choy? Yes, you can. Bok choy should be frozen within 12 hours after purchasing. After freezing, place them into freezer bags in bulk. For best freezing quality, don’t over-pack bags, just 4 – 5 pieces per bag are enough.

Hence, today, we will show you the ultimate guide on how to freeze bok choy.

Why Should You Freeze Bok Choy In The Fridge?

1. The Impact of Temperature

The first reason why freezing bok choy is an excellent option lies in the effect of low temp. Temperature is an important determinant of when vegetables are fresh.

The change in temperature affects the intensity of the respiration. The higher the temperature, the higher the rate of biochemical reactions occurring in fruits and vegetables.

Unlike medium heat, the use of the refrigerator will help lower the temperature, thereby reducing the activity of physiological and biochemical processes in fresh bok choy and microorganisms.

At this time, the cells in the harmful microorganisms will shrink, reduce metabolism, and multiply. Thanks to that, bok choy can stay fresh for longer.

2. The Impact of Humidity

Besides temperature, humidity is also an important factor when it comes to storage. The relative humidity of the air in the storage medium determines the evaporation rate in the bok choy.

A storage with a high concentration of water vapor will create an environment conducive to bacteria growth, thereby significantly reducing food spoilage.

However, when storing, you should also note to adjust the humidity in the cold storage compartment to match the bok choy. When the ambient humidity falls too low, the water vapor’s respiration intensity and evaporation rate will become higher, possibly even causing the bok choy to wilt.

3. The Impact Of Gas Substances

The gas components in the storage environment affect vegetables’ storage time in general and bok choy in particular.

Oxygen is a major ingredient in the refrigerator; if the amount of oxygen becomes higher, the respiration will be more intense and vice versa. Given that fact, reducing the amount of oxygen means stopping respiration, inhibiting, and hindering cell survival. 

For this reason, manufacturers often adjust the level of oxygen in the refrigerator to a level just enough to sustain food in the process of aerobic respiration. In this environment, most of the activity of bacterial cells is paralyzed due to a lack of oxygen.

Another gas in the storage medium is Co2. Studies have shown that the more CO2 content, the longer the storage time. For fresh fruits and vegetables, CO2 inhibits respiration, thereby reducing wilting. CO2 also has a great effect in slowing the growth of rot microorganisms.

How to Freeze Bok Choy?

How To Freeze Bok Choy

Step1: Clean Bok Choy With Water

As soon as you buy the vegetables from the store, the first thing you need to do is wash them. This is because today’s vegetables and fruits contain pesticides and many other growth chemicals that are harmful to human health.

Homemakers should soak with clean water several times. It is best to wash 4-5 times for 1 minute.

Experts have shown that 3/4 or more pesticides can be removed by washing with cold water. However, the amount of pesticides that have been absorbed into the fruits and vegetables is quite difficult to remove.

If possible,  you should add two teaspoons of salt and ginger powder to warm water, then soak the green leaves for half an hour before rinsing all excess water. Those actions will help remove pesticides better than just cold water or ice water.

Step 2: Use Vacuum Bags

Vacuum bags can be used to freeze cabbage, baby bok choy, or any other vegetables. It is recommended to use vacuum bags because the vacuum, in theory, will not contain any matter inside it, including oxygen, carbon dioxide, dust, and bacteria.

This is a very good environment to fight oxidation, the onslaught of mold bacteria, which is the main cause of spoilage.

Furthermore, the refrigerator is a storage place for a wide variety of foods, making it easier for bacteria to move from place to place and cause bok choy to spoil more quickly.

Using a special bag will help minimize this situation. When purchasing the vacuum bag, it will come either with a small air vacuum or a manual pump.

You will need to read the instructions and begin the process of drawing the excess air out. Keep in mind that you should always zip the top of the bag to make sure air cannot get inside.

Step 3: Use The Food Wrap And Glass Food Box

As mentioned above, low humidity in a refrigerator can rapidly increase the evaporation rate of fruits and vegetables, making them more susceptible to spoilage.

In fresh bok choy, water content accounts for 85-95%, only 5-15% is dry matter, so if just kept in the refrigerator, this water will evaporate in a day or two.

To overcome the over evaporation process, thin carriers such as PE or PVC film are often used. They can both be used to ensure food’s cleanliness while also limiting the evaporation of water when stored in low humidity environments.

Another somewhat safer and preferred way to do this is to use a glass jar to ensure you and your family’s health. If you wrap vegetables with plastic wrap made of poor quality plastic, toxic substances will be absorbed into your food for a long time, causing many dangerous diseases.

The airtight box can help resist scratches and create a space with adequate humidity, reducing moisture command between the food and the environment.

Step 4: Label The Date

Labeling and organizing your food will help you preserve your food more effectively. Many people often skip this step, but it helps a lot. Homemakers should label the bok choy freezer bags‘ purchase date and keep them in the refrigerator for 5-7 days.

This will save you from remembering what date you bought the vegetables and whether they can still be used to make delicious dishes like soups.

How Long Should You Leave Bok Choy In The Fridge?

Since the refrigerator cannot completely destroy bacteria and eliminate natural decomposition, it is best to leave frozen bok choy or refreeze bread in the refrigerator for about 7-9 days top.

If left for longer, the bok choy will easily wilt and taste badly. Worse, the bacteria in the vegetables can cause intestinal illnesses like indigestion or food poisoning.


Bok choy contains a lot of fiber and vitamins, which are essential for the human body.

However, it is this nutrient that allows the bacteria to grow better. Therefore, it is necessary to freeze bok choy in the fridge to eat longer. We hope that you found a satisfactory answer in this article 

Thank you for reading!

Kevin Richard

Hi all! I’m Kevin. I spend plenty of time in the kitchen every day because I love cooking healthy and delicious foods for my family and friends. Cooking gives me a chance to be creative and fun. It’s also one of the most meaningful ways to express my love and take care of my little family.

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