Buying items in bulk is one of the best grocery saving tips that continues to work month after month, but I do wonder if the 50 pounds of flour sitting in my closet – in it’s original thick paper bag – is the best way to store it.
Growing up, my mom had mentioned something about flour bugs, but I’ve never seen them before. Or maybe I’ve just never noticed them before?
I admit – seeing flour bugs or even bugs in your whole grains can be pretty gross, but all is not lost and in fact, it’s pretty common!
Why am I finding flour bugs?
This is a pretty loaded question, and one that often comes with more questions too. The best way I can think of addressing it all is to lay it all out, question-and-answer style.
Does flour go bad?
The short answer: Yes.
The long answer: The more processed the flour is, the longer it takes to go bad.
Flour is made from a whole grain, with the most common whole grain being wheat. Once the whole grain is no longer whole, the oils in the grain can go rancid (or sour, stale, etc.).
Freshly milled flour will go rancid much more quickly than store-bought all-purpose flour. This is why home bakers who grind their own wheat will make flour just before use in recipes.
Where should we store flour?
Going back to the level of processing, all-purpose and other non-whole grain flours can be stored in a cool, dry place without any issues for about one year.
Whole grain flours should be kept in a refrigerator for the short term, about 2-5 days. If you need to store whole grain flour for longer than a handful of days, the freezer is the best place.
How should we store flour?
If the flour will be used fairly quickly, it can be left open or in a container with a lid.
Think about local bakeries and delis – they’ll often have a bucket of flour open on the counter or a lid may be slightly ajar. They will use a good bit of flour in a single day, so sealing it up tight isn’t an issue.
If the flour will be used within a month or two, it should be kept in a sealed container.
One to two months is considered “quick” in terms of flour usage, so you can keep your flour in a container that is NOT sealed (i.e. the same thick paper bag, rolled down) but the chances of the flour going rancid increase.
If the flour will not be completely consumed within two months, it should be stored in a sealed container.
What type of storage container is best for flour?
Depending on the quantity of flour on hand, there are food-grade buckets are available in a wide variety of sizes.
1 gallon buckets with lids would be best for daily use or the pantry. They’re light enough to move from counter to pantry and back, but big enough so that you’re not constantly refilling the flour every time you make bread.
3.5 gallon buckets with lids are best for keeping on the floor of the pantry or in a nearby closet. This is where you’d keep the majority of the flour, refilling the 1 gallon bucket with the flour from the 3.5 gallon bucket. These will be too heavy to easily use in daily baking, but not so heavy that you couldn’t slide it on the floor or pick it up if you absolutely had to.
5 gallon buckets with lids are best for long-term storage in a basement or garage or excess pantry. This size will be too big for most people, but is ideal for those who buy whole grains in bulk. You’d keep your whole grains in this bucket and bring the smaller 3.5 gallon bucket to this one when it’s empty for a refill. Then you’d grind your flour and fill up the small 1 gallon bucket.
Why are there flour bugs in grains?
If you notice little brown bugs in your flour, cereal, grain or rice, those are called weevils. Weevils look like little grains of rice, but they’re brown and they move. On their own.
Ever notice your flour tangled in something that looks like a cobweb? That means your flour is infested too.
Have no fear – flour bugs don’t just suddenly appear in your flour one day because you forgot to mop some mysterious sticky substance that one of your children accidentally spilled in your pantry. If you see flour bugs, they were already there when you bought it.
The female weevil lays eggs in the wheat kernel and it can sometimes survive the milling process. The eggs will hatch if they’re in warm or humid conditions, or have reached their maturity. The flour bugs eat the grain and then seek to mate… while eating more grain.
Why are there flour bugs in my boxed cereal?
Weevils aren’t particular about what they eat. If you find them in any other seemingly sealed spot, they’ve weaseled their way out of their original infestation spot and meandered to your rice, or cereal, or coffee.
Essentially, this means that what you’ve already eaten was infested too.
Weevils are also not particular about containers. Thin cardboard boxes that cereal comes in, thin paper bags that flour comes in and even the plastic bags inside cereal and cracker boxes are no match for weevils.
The best containers to keep your dry goods in while keeping weevils out are these food-grade containers with lids that seal:
What can I do to prevent eating beetles?
1. Clean the Area.
First, get rid of the infested item. Remove everything from the area, vacuum out any cracks and sanitize the shelves with white vinegar. If you’re sensitive to the smell of vinegar, make citrus-infused vinegar instead.
Check areas regularly for re-infestation as it may take awhile to completely rid of all flour bugs and larvae, and clean your storage area regularly.
2. Store dry goods properly.
Freeze newly purchased grains and flour for at least three days to kill any eggs. Some sources recommend freezing for up to one week. (Note that freezing will kill the eggs, but not remove them.)
As a general guideline, don’t buy more grain than you will use within four months. Store grain in a tightly sealed container, not a bag. Weevils are HUNGRY little devils and can eat through bags. (See my storage recommendations above).
3. Prevent Future Infestation
Adding whole bay leaves and garlic cloves to the area seems to deter flour bugs from setting up shop in your pantry. Garlic may leave a trace flavor in your baked goods, so if you don’t want that, go for the bay leaves instead.
You can also apply tea tree oil to a few cotton balls and place them throughout the pantry.
Will eating beetles harm me?
Other than give you the heebie jeebies, they’re harmless. In fact, the heat from baking kills the eggs and any beetles that may have made their way into your batter. So while the odds of us eating weevils – or have eaten weevils in the past – are high, the mortality rate is low.