How to Tell if Brussel Sprouts Are Bad: 7 Signs of Spoilage (2024)

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Learn how long brussel sprouts last and when it’s time to toss them

Co-authored byJennifer Levasseurand Hunter Rising

Last Updated: April 9, 2024Fact Checked

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  • Signs of Bad Brussel Sprouts
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  • How do you tell if cooked brussel sprouts are bad?
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  • Expert Interview
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  • Tips
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  • Warnings

Brussel sprouts are a flavorful and nutritious addition to your meal, but making sure they’re still good is important to prevent any foodborne illnesses. Bad odors and discolored leaves are some of the most common signs of spoilage to look out for, but there are other ways to determine if your brussel sprouts are safe to eat. Keep reading, and we’ll cover what bad brussel sprouts look like whether they’re fresh or cooked.

Things You Should Know

  • Throw out fresh brussel sprouts that have a foul odor, yellow or wilted leaves, a mushy or slimy texture, or dark spots.
  • Use fresh brussel sprouts within 1–2 weeks of getting them. Store the brussel sprouts in a plastic bag inside your fridge, and wash them before cooking them.
  • Get rid of leftover cooked brussel sprouts after 3–4 days in the fridge, or when they have unpleasant odors and mold growth.

Section 1 of 3:

Signs of Bad Brussel Sprouts

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  1. 1

    Foul, moldy odor When your brussel sprouts are still fresh and good to eat, they won’t have much of an odor or they may smell a little earthy. Brussel sprouts normally only smell after you cook them, so toss out any that have any strong odors while they’re still raw.[1]

    • When you cook brussel sprouts, it’s normal if they have a slight scent of sulfur. Compounds breaking down in the leaves during cooking release the smell.
  2. 2

    Yellow or wilted leaves Fresh brussel sprouts have bright green leaves that are tightly compacted together. As the brussel sprouts get older and start to spoil, their color lightens and the leaves soften and separate.[2]

    • If only the outermost leaves are yellow or wilted, just peel them off and cook the rest of the brussel sprout. If it looks wilted or yellow throughout the entire veggie, then toss it out.[3]

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  3. 3

    Mushy or slimy texture Brussel sprouts feel firm and dry to the touch while they’re fresh, but bacteria that cause spoilage will break down and soften the leaves. If you feel a slimy film or if your brussel sprouts have soft tender spots, then throw them away instead of eating them.[4]

  4. 4

    Black or brown spots Brussel sprout leaves normally look bright green and have light green or white stalks. While they age, more brown and black spots form as the leaves deteriorate. If you notice multiple dark brown or black spots covering the leaves and stalk, the brussel sprouts have started going bad and it’s time to toss them.[5]

    • If the brown or black spots are light and only on the outer layers, peel off the leaves or slice the stalk with a sharp knife. If it still looks brown or black, then throw the brussel sprout away.
  5. 5

    Multiple insects inside the leaves Brussel sprouts are a little prone to pests like aphids and beetles that may hide between the tightly packed leaves. Cabbage worms may also chew through leaves and create holes. While you can rinse away a stray bug here or there, it’s better just to throw your brussel sprouts away if they’re crawling with pests.[6]

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Section 2 of 3:

How do you tell if cooked brussel sprouts are bad?

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  1. 1

    Mold growth When mold spores land on your food, they will slowly grow and form on cooked brussel sprouts, even if you keep them in the fridge. If you notice slimy or fuzzy spots on your leftover brussel sprouts, avoid eating them and toss them out.[7]

    • Even if mold is only on a part of the brussel sprouts, it may contaminate the surfaces around it and make the rest of your food unsafe to eat.
  2. 2

    Unpleasant, sour odors While cooked brussel sprouts already have a slight sulfur smell, the odor may turn sour the longer you keep them in your fridge. If you notice that your brussel sprouts have a different smell than they had before, play it safe and throw them away instead of risking getting sick.[8]

    • Bacteria may grow on leftovers even if there are no signs of mold or odors. If you’re not sure how long the brussel sprouts have been stored, it’s best to throw them out to play it safe.
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Section 3 of 3:

How long do brussel sprouts last?

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  1. 1

    Fresh sprouts last 1–2 weeks in the fridge or 3–5 weeks in the freezer. When you have fresh brussel sprouts, keep them in a plastic bag inside of your fridge near your other vegetables.[9] If you want to freeze your brussel sprouts, boil them in water for 3–5 minutes first to preserve their flavor and place them in an air-tight container.[10]

    • Wait to wash your brussel sprouts until just before you cook them. Washing brussel sprouts before storing them could make them spoil more quickly.
    • After 3–5 weeks in the freezer, your brussel sprouts will still be safe to eat, but may taste less flavorful when you reheat them.[11]
  2. 2

    Cooked sprouts last 3–4 days in the fridge or 3–4 months in the freezer. After cooking your brussel sprouts, store them in an airtight container and put them in the fridge. After 3–4 days, there’s more risk for bacteria to form, so toss the leftovers out. Otherwise, freeze the brussel sprouts and use them within 4 months for the best flavor and texture.[12]

    • When you reheat your leftovers, make sure they reach an internal temperature of 165°F (74°C) to kill any bacteria that may have formed.[13]
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Expert Q&A

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    Tips

    • After cooking brussel sprouts, refrigerate the leftovers within 2 hours to prevent bacteria from growing more quickly.[14]

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    • Choose brussel sprouts that are small, have firm heads, and are all the same size so they cook evenly.[15]

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    Warnings

    • If you’re ever in doubt about whether your brussel sprouts are good or bad, throw them away so you don’t risk getting sick.

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    Expert Interview

    Thanks for reading our article! If you’d like to learn more about cooking, check out our in-depth interview with Jennifer Levasseur.

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    About This Article

    How to Tell if Brussel Sprouts Are Bad: 7 Signs of Spoilage (25)

    Co-authored by:

    Jennifer Levasseur

    Personal Chef

    This article was co-authored by Jennifer Levasseur and by wikiHow staff writer, Hunter Rising. Chef Jennifer Levasseur is a Personal Chef and the Owner of The Happy Cuisiniere based in Breckenridge, Colorado. She has over 12 years of culinary experience and specializes in Mountain and Contemporary Rustic cuisine. Moreover, she can craft dishes and modify menus to accommodate dietary restrictions, such as gluten-free, vegetarian, vegan, pescatarian, and dairy-free diets. In addition to a Bachelor’s degree in Marketing and Management from the University of Houston, Chef Jennifer holds Associate’s degrees in Culinary Arts and Baking & Pastry Arts from Houston Community College. This article has been viewed 23,710 times.

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    Categories: Fruits and Vegetables

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    How to Tell if Brussel Sprouts Are Bad: 7 Signs of Spoilage (2024)

    FAQs

    How to Tell if Brussel Sprouts Are Bad: 7 Signs of Spoilage? ›

    Things You Should Know

    How can you tell when Brussels sprouts are bad? ›

    If any of the leaves have brown spots or are yellowing, it's a sign of early spoilage. If you remove the blemished leaves and the interior looks OK, you can still use the sprout. However, if the interior leaves are also showing blemishes or yellowing, it's best to toss it (or compost it, if you can).

    What happens if I eat bad Brussels sprouts? ›

    Sprouts grow best in warm, humid conditions, which can also lead to the growth of germs; when they are eaten raw (as they often are, especially in sprouts sandwiches), it can lead to food poisoning from Salmonella, E. coli, or Listeria.

    What does a bad sprout look like? ›

    Bad brussel sprouts can have a bad smell, similar to old cabbage. They might be a lighter green color, have brown edges, are moldy, or even slimy. What is this? Even pulling back a few leaves this sprout was still yellow and was starting to get soft.

    What's wrong with my brussel sprouts? ›

    Problems most likely to be encountered include; Wilting young plants: Plants may wilt after planting due to lack of water. Adequate water at planting and subsequently is required. A 'starter fertiliser' can help (high phosphorus liquid fertiliser used at half strength).

    How to tell if sprouts are bad? ›

    Place the sprouts in the fridge as soon as you get home and use them before the best-before date. Use within two days of purchase if they are not pre-packaged. Throw away any sprouts that are past their best-before date or that have lost their crispness, look wilted or smell musty.

    How do you know if brussel sprouts are safe to eat? ›

    If you feel a slimy film or if your brussel sprouts have soft tender spots, then throw them away instead of eating them. Black or brown spots Brussel sprout leaves normally look bright green and have light green or white stalks. While they age, more brown and black spots form as the leaves deteriorate.

    What color should Brussels sprouts be inside? ›

    Brussels sprouts are small green buds made up of many tightly formed layers: they look like tiny cabbages. The leaves are usually bright green, sometimes tinted yellow, and of slightly lighter color inside the cabbage.

    Why do my Brussels sprouts taste weird? ›

    If brussels sprouts taste bitter to you, you may have a gene that senses bitter compounds in brassicas. It is similar to the gene that makes cilantro taste like soap to the people who have it, and like a yummy herb to people who don't.

    What is the white stuff on Brussels sprouts? ›

    If your sprouts smell bad, then they're most likely bad - DO NOT EAT THEM! However, a lot of the times what you think is mold are these tiny little white fibers coming from the roots telling you that your sprouts are thirsty.

    Why do I feel weird after eating brussel sprouts? ›

    Like other cruciferous veggies, Brussels sprouts have a type of carbohydrate that your body can't easily break down. This can cause you to have belly pain, gas, and either diarrhea or constipation.

    Why avoid brussel sprouts? ›

    Although a healthy vegetable, consuming too many Brussels sprouts can be unsuitable for people on anticoagulants since it contains vitamin K, which results in blood clotting. Another issue with consuming Brussels sprouts excessively is that it can lead to gas and bloating.

    Are black spots on Brussels sprouts mold? ›

    Fungal and bacterial infections cause black spots on Brussels sprouts. Prevent with spacing, air circulation, and tool sterilization.

    Can brussel sprouts last 3 weeks in the fridge? ›

    Use a plastic bag and the crisper drawer.

    Even though Brussels sprouts can last up to a week in the fridge, sometimes a little longer, their taste gets stronger and less sweet with time. They are at their best when prepared within three to four days of purchase.

    How long do sprouts last in the fridge? ›

    Your sprouts should feel dry to the touch afterwards. Sprouts treated this way can normally be refrigerated in an airtight container for up to 5 days or more, but we still recommend you to eat them as soon as possible. After all, the fresher is always the better.

    How do you tell if brussel sprouts are fully cooked? ›

    Add the Brussels sprouts and boil lightly for four to six minutes or until the sprouts are al dente, but still beautifully green. You can test with a sharp knife, but trying one is a surer way to tell. Drain off the water and serve immediatly with the butter and pepper if desired.

    How long do Brussels sprouts last on the stalk? ›

    How long can you keep Brussels sprouts on the stalk? Brussels sprout stalks will keep for up to 10 days in the refrigerator. You can also store them on the countertop or suspend them by their leaves. Without refrigeration, the sprouts and stem should stay fresh for four or five days.

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