What Do Cannabis Seeds Look Like? A Visual Checklist
Quick answer: What do cannabis seeds look like when they are ready to plant? Mature seeds tend to be small, teardrop shaped and hard, in shades of brown or gray, often with darker stripes or speckles. Pale green or white seeds that feel soft are often immature. Looks give you clues about ripeness, but they cannot prove a seed will sprout.
A cannabis seed is a small, rounded seed with a pointed tip on one end and a slight ridge running around its middle where the two halves of the shell meet. Inside the shell sits the embryo and the food it needs to start growing. How the outside looks tells you mostly about how far the seed matured on the plant before it was harvested.
What Mature Cannabis Seeds Look Like
Most growers look for four things in a mature seed:
- Colour. Mid to dark brown, gray or tan, rather than green or white.
- Shell. Hard, intact and slightly glossy or waxy, with no cracks.
- Pattern. Often striped, mottled or speckled with darker markings, though plain seeds can be just as good.
- Feel. Firm when pressed lightly between two fingers. A ripe seed does not dent or crush.
These are grower observations rather than research findings. No US Extension source we found grades cannabis seeds by colour or pattern, so read them as tendencies, not rules.
Does Seed Size Matter?
Less than many people tend to think. In one Oregon State University study of two CBD cannabis varieties, published through Murray State University, the difference in seed size did not affect seed quality. Some strains simply make smaller seeds than others.
Visual Checklist for Cannabis Seeds
| What to check | Usually a good sign | Usually a warning sign |
|---|---|---|
| Colour | Brown, gray or tan | Pale green or white |
| Shell | Hard, whole, smooth | Cracked, split or crushed |
| Firmness | Holds firm under a light press | Dents, squashes or feels hollow |
| Pattern | Stripes, mottling or plain | Pattern alone tells you little |
| Size | Typical for the strain | Size alone tells you little |
| Surface | Clean and dry | Mold, fuzz or a damp feel |
What Immature Cannabis Seeds Look Like
Immature seeds tend to be pale green, cream or white, and they often feel soft. Their shell has not fully hardened, so they may dent or crush with light pressure. These seeds were usually harvested before they finished ripening on the plant.
Maturity, on the other hand, matters. In the Oregon State study, seeds from the upper two thirds of the plants, which were more mature, had better quality at first than seeds from the less mature lower third. In that study, the lower part was harvested 7 days after the upper part, and its quality became similar to the upper part after 8 days. The study abstract does not say where those 8 days were spent, so read it as a sign that a little extra ripening can matter, not a fixed rule.
If you find seeds in your own buds, they likely came from an accidental pollination. Our guide on how to tell if your female cannabis plant has been pollinated covers that.
Seed Myths to Skip
Tiger stripes mean a better seed. Stripes are a common pattern on mature seeds, but plenty of good seeds are plain or mottled. Pattern varies by plant and genetics.
Bigger is always better. The Oregon State study found size did not affect seed quality.
A seed that sinks is good and one that floats is bad. This popular check is covered in our guide to the cannabis seed float test.
How you keep seeds after you buy them matters as much as how they look, which our guide to cannabis seed storage mistakes explains. For the terms on a seed pack, see our guide on how to read cannabis seed descriptions.
How to Check a Few Seeds at Home
Looks only go so far, of course. If you have a larger batch of saved or older seeds, a paper towel check shows how many will actually sprout. Iowa State University Extension and the University of Arkansas describe the same basic method for garden seed.
- Count out a sample. Iowa State suggests at least 20 randomly picked seeds, with 50 better and 100 best. Use a sample that includes all types of seed in the batch.
- Lay them on a damp paper towel. Space the seeds out so they do not touch.
- Roll and bag the towel. Fold or roll the towel to hold the seeds, place it in a plastic bag and write the date on the bag.
- Keep it warm. Iowa State says to keep the roll in a warm place, 70 to 80°F.
- Keep the towel moist. Arkansas Extension says the towel should be moist but not saturated. Check it every day or so.
- Check after a few days. Iowa State says to check in two or three days and every day after for about a week.
- Count the sprouts. A seed has sprouted when a small root pushes through the shell.
- Work out the percent. Divide the number that sprouted by the number tested, then multiply by 100.
Seeds used in the check are usually not worth planting afterward, so only test what you can spare.
Troubleshooting
Seeds are pale green or white. They were likely harvested early. Some may still sprout, but expect a lower rate. If you are saving your own, let seeds ripen longer on the plant next time.
Seeds crack or crush under a light press. The shell was weak or the seed was immature or damaged. Set these aside.
A seed has a hairline crack but is otherwise firm. It may still be viable. Handle it gently and plant it soon rather than storing it.
Good looking seeds failed to sprout. Appearance cannot show if the embryo is alive or if the seed was stored badly. Check how the seeds were stored and try a paper towel check on a few more.
Seeds look moldy or feel damp. Moisture got in during storage. Dry, cool storage helps prevent this next time.
Sources
- Oregon State University authors (Elias, Wu and Stimpson 2020), Seed Quality and Dormancy of Cannabis sativa L., Murray State University Digital Commons: https://digitalcommons.murraystate.edu/jahr/vol2/iss1/2/
- Iowa State University Extension and Outreach, How to Store Seeds and Test Germination Rates: https://yardandgarden.extension.iastate.edu/how-to/how-store-seeds-and-test-germination-rates
- University of Arkansas Cooperative Extension, FSA3149 How to Conduct a Seed Germination Test at Home (PDF): https://uaex.uada.edu/publications/pdf/FSA-3149.pdf
The seed study covers CBD cannabis varieties and the test guides cover garden seed. We pass them on as general guidance.
FAQ
What do cannabis seeds look like?
Cannabis seeds are small, teardrop shaped seeds with a hard shell and a ridge around the middle. Mature weed seeds tend to be brown, gray or tan, often with darker stripes or speckles. Pale green or white seeds that feel soft are often immature. Looks hint at ripeness but cannot prove a seed will sprout.
Are dark cannabis seeds better than light ones?
Dark seeds tend to be more mature, and maturity matters. In one Oregon State University study, seeds from the more mature part of the plant had better quality at first. But colour is not a guarantee. A dark seed that was stored badly can still fail, and colour varies by strain.
Do tiger stripes mean a seed is good?
Not on their own. Stripes are a common pattern on mature seeds, but many good seeds are plain or mottled instead. Pattern varies with genetics. See stripes as one sign of ripeness among several, along with a hard shell and a darker colour, not as a grade.
Can you tell a good cannabis seed by looking at it?
Only roughly. A hard, intact, darker seed is more likely to be mature, while pale or soft seeds often are not. Looks cannot show whether the embryo is alive or the seed was stored well. A paper towel check on a few spare seeds, as Iowa State Extension describes, gives a clearer answer.
What do immature cannabis seeds look like?
Immature cannabis seeds tend to be pale green, cream or white, and they often feel soft or dent under light pressure. Their shell has not fully hardened. In an Oregon State study, less mature seeds had lower quality at first, though the gap closed after about 8 days.
