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Bloom is actually a good sign.
That dusty, white surface on your grapes might make you nervous. Is it dirt? Pesticides? The good news is that this coating is completely natural. It's called "bloom," and it actually helps protect your grapes as a type of environmental shield.
While your grapes should still get a good rinsing before you start snacking, here's what bloom really is, how to tell it apart from mold, and the best way to wash and store grapes at home to keep them fresh longer.
Related: The 16 Most Common Types Of Grapes For Eating
What Is Grape Bloom?
Bloom is the fine, powdery film that coats grapes, giving them a frosty appearance. Also known as epicuticular wax or blossom, bloom acts like a protective barrier, keeping grapes firm and fresh.
You might notice that this coating rubs off easily when you handle the grapes. You can choose grapes based on this idea—knowing that grapes with visible bloom are usually fresher and more lightly handled than those that have been stored or transported for a while.
What's On Your Grapes
The majority of bloom is natural wax produced by the grape itself, but it can also collect a small amount of dust or wild yeast from the air.
Related: Scuppernong Grapes Are The Stuff Of Southern Legend
The Purpose )f Bloom
Bloom plays a few key roles in keeping grapes fresh:
- UV protection: Bloom acts like a shield, reducing sun exposure and environmental stress.
- Pathogen barrier: This coating guards the grapes against bacteria and fungi.
- Moisture retention: Keeps the grapes from drying out.
Is Bloom Safe And Does It Affect Flavor?
While it might seem unappetizing, bloom is perfectly safe to eat. It's not mold, dirt, or pesticide residue. If you do prefer to remove it, a simple rinse under cold water will wash it away. Left on, you might notice a slightly chalky or bitter taste, though most won't notice a difference in flavor at all.
Could It Be Mold Instead?
Since both mold and bloom can appear white on grape skins, it's helpful to note the difference. Bloom rubs off easily, and looks like a thin, dusty film. Mold will appear fuzzy or thick, does not wipe away cleanly, and often clusters near the stem where the grapes are connected.
Other signs of mold or spoilage include shriveling, leaking juice, soft spots, or an off smell. If you notice any of these, discard the affected grapes to avoid spoiling the rest of the bunch.
Related: Can You Eat Grape Seeds?
The Best Way To Wash Grapes
Even though bloom is safe, grapes still need a good wash before enjoying. During harvest and transport, they can pick up pesticide residue, mold spores, bacteria, and dirt. A quick rinse can help, but it may not be thorough enough. Here's the most effective way to clean grapes:
- Prepare a cleaning solution: Mix 1 part vinegar with 3 to 4 parts cold water in a large bowl or container.
- Submerge: Submerge and gently agitate the grapes with your fingers to loosen any debris.
- Soak: Let soak for 5 to 15 minutes.
- Rinse: Drain into a colander and rinse well under cold water.
- Dry: Dry thoroughly using paper towels or spin gently in a salad spinner.
Related: How To Wash Grapes With Vinegar To Remove Dirt And Pesticides
How To Store Grapes After Washing
To maximize shelf life, store grapes unwashed until you're ready to eat them. This reduces excess moisture that can cause them to spoil more quickly. If you're storing leftover washed grapes, store in a ventilated container lined with a paper towel to absorb any possible moisture. Store in the crisper drawer in the refrigerator, where they'll stay fresh for about 2 to 3 weeks.
Related: How To Store Grapes To Make Them Last
Read the original article on Southern Living
