More commonly, growers use the paper towel method. Dampen a paper towel, ensuring it isn’t soaking wet. Place this on a kitchen plate and put the seeds on top, then put another plate upside-down on top. A moist, dark, warm environment allows the seeds to sprout. Check on the seeds once a day; after germinating, you should see a white taproot emerge.
Another type of bad seeds is male cannabis plants. There’s a 50/50 chance with regular seeds as to whether any given seed is male or female. The problem is that male plants will pollinate the females once they reach maturity, destroying the valuable THC content of female plants.
The feel of cannabis seeds is another good indicator. Hold the seed between your thumb and forefinger and give it a light squeeze. Don’t apply too much pressure – just enough to test its integrity.
Method #3: The Water Test
There are several easy methods for testing cannabis seeds. Most of them can be performed before germination, saving you some time and resources. Let’s find out how to check your seeds.
In some instances, you can crack the seed open and see inside if you can’t tell anything from the outer shell. An oily inside with a musty smell means that the seed has gone bad. Similarly, black inside the seed means that it’s fermenting. Again, it won’t germinate in this instance.
Cultivating marijuana is a bit of a learning curve, so don’t worry if you mess up your crop from time to time. It will only get easier with time.
What Makes a Cannabis Seed ‘Bad’?
If the seed cracks under slight pressure, then it’s unusable. It’s likely to be past its sell-by date.
Waste not, want not!…
In the years before Dutch Passion invented feminised cannabis seeds, people would often try to predict which seeds would produce female plants. Of course, this was impossible. But it didn’t stop people going to great lengths, even measuring the weight of individual seeds in an attempt to derive some knowledge from the seeds physical appearance/size.
Some dark cannabis seeds have black lines on them (tiger prints), giving them a distinctive appearance. Other seeds have no significant patterns or markings on them at all. Dark black cannabis seeds can be occasionally seen.
Knowing whether you prefer e.g. a Kush, a THC rich vs CBD rich strain, a fruity strain or a Skunk strain is a good place to start. If the array of cannabis seed choices can seem overwhelming, the following article may help you select the best strain for you.
White cannabis seeds germination test results
One suggestion is that the white cannabis seeds may have a slightly softer shell, allowing the white cannabis seeds a slightly faster germination. The experiment was repeated twice more. On each occasion, the seed germination rates were the same, but the white seeds tended to germinate faster.
The autoflower seeds all came from the same batch, meaning that they were produced from the same parent genetics under the same conditions. Seeds were chosen simply on the basis of their appearance. 9 white cannabis seeds and 9 dark coloured Think Different seeds were selected. They were planted in moist (but never soaked) soil and a time lapse video was made.
Why are some cannabis seeds white and some black?
In the video below you can see a germination comparison. On the left hand side, you can see 9 white Think Different autoflowering seeds. On the right hand side there are 9 dark coloured Think Different seeds.
Note that the white cannabis seeds on the left hand side were the first seeds to germinate, with 8 out of 9 seeds sprouting pretty quickly. In the end all 9 seeds germinated on both sides, which was a 100% score. In terms of white seeds vs dark seeds (cannabis), there was no difference in the germination rates.
Size is relative, but if you are able to compare several seeds at once, the higher quality seeds are larger. When it comes to seeds, less is more. The fewer seeds that comprise any given amount, an ounce or a gram for example, is generally an indicator of higher quality seeds. The biggest seeds within a species generally have more energy stored within them and have a greater potential to mature into a productive plant. Note that indica strains tend to produce larger seeds than sativa strains so make sure the comparison is made among like seeds.
This is another aspect you, the buyer may not be privy to. Quality seed is harvest when fully mature. If seed was collected before the plant was able to load as much stored energy into it as possible, then that seed will be starting out life in a deficit. Color, as referenced above can be an indicator of whether or not a seed was harvested at the appropriate time.
What to Look for in a Cannabis Seed
So, you’ve decided to grow your own marijuana from seed. How do you know if those little, round nuggets in your hand will grow up lush and produce beautiful, productive buds? How do you know if they are duds? While ultimately the genetics will determine the destiny of those little weed seeds, and proper care will help them to realize their full potential, there are some markers you can assess to see if what you have is quality seed, indeed.
While all cannabis seed is not identical in color, there are some consistencies. Healthy, viable seed will be light to dark brown in color. Seed that is light green or even whitish in color is underdeveloped and should be tossed out. Healthy seed will also have a burled or turtle shell-like pattern on its seed coat.