Does Cannabis Flower Go Bad Over Time? What You Need to Know

Yes, cannabis flower can go bad, but it does not spoil on a strict date the way food does. Stored well, dried flower keeps most of its quality for six months to a year. After that, it slowly loses potency, aroma and flavor. Kind Seed Co explains how to tell if your flower is past its best and how to store it so it stays fresh longer.

Most people buy small amounts and use them long before age becomes a problem. But if you grew a big harvest or found an old jar at the back of a closet, it helps to know what to look for.

How cannabis changes as it ages

Over time, the taste, texture and potency of dried flower change. How fast this happens depends mostly on storage. Potency keeps fading the longer flower sits. That is because THC slowly converts into CBN when it is exposed to UV light and air.

Old flower is usually just weaker and harsher, not dangerous. The big exception is mold. Moldy flower should always go in the trash.

How to tell if your flower has gone bad

Look at it

Fresh flower has a vibrant green color, sometimes with streaks of purple. If the color has faded or turned yellow or brown, or the buds look dry and crusty, the flower is past its prime and has likely lost much of its potency.

Check closely for mold, too. Fuzzy white patches or odd colors that should not be there are warning signs. If your flower does not look right, the safest choice is not to use it.

Smell it

Aging flower loses its fragrance and may smell more earthy than it used to. That flower is still usable, just past its best. If it smells bad or musty, though, mold may be growing, and you should throw it out. Trust your nose.

Feel it

Old flower tends to feel dry, brittle or crumbly. Flower that feels moist, wet or fuzzy may be growing mold and should be discarded.

How to keep cannabis fresh longer

Light, humidity, temperature and oxygen all affect the aroma, taste and condition of dried flower. Get these four right and your buds will last much longer.

Use the right container

Skip plastic bags and plastic tubs. Plastic holds static that can pull at the delicate trichomes, the hairs on the flower that look like tiny crystals and produce cannabinoids and terpenes. Metal tins are not ideal either, since they can let in too much oxygen. Airtight glass jars, such as mason jars, are your best option. They don’t hold static, and they keep out oxygen and moisture.

Control temperature and humidity

• Keep it cool and dark. Store flower between 60 and 70°F and away from direct sunlight, which breaks it down.
• Avoid heat. Warm storage can trap moisture and invite mold.
• Avoid the cold. Storing flower too cold dries it out and costs you trichomes.
• Hold humidity at 59 to 63%. Drier air leaves buds brittle, and wetter air invites mold. A hygrometer helps you keep track, or you can store your flower in a humidor made for cannabis.

If your flower has already dried out, our guide on why you may need to rehydrate cannabis shows you how to bring back some moisture.

Keep strains and gear separate

Give each strain its own container so flavors do not mix. Keep grinders and other gear out of your storage jars, since leftover residue can affect freshness.

Can you store cannabis in the freezer?

Freezing works for food, but it is a poor choice for dried flower. Freezing temperatures make trichomes brittle, so they snap off when you handle the buds. The freezer can also expose flower to moisture, which can lead to mold. For more detail, read should you freeze your cannabis buds.

Buy or grow what you can use

The simplest way to avoid stale flower is to grow or buy only as much as you can use within six months to a year, and to store it properly. Want to grow your own supply? Start with our feminized cannabis seeds, or contact us with your storage and growing questions.