Check out Johanna’s full video series on how to grow weed on Leafly’s YouTube .
Autoflowering seeds are also popular with beginning growers. They are easy to grow because you don’t have to worry about light cycles and how much light a plant receives.
How weed clones work
Cannabis used for hemp production has been selected for other traits, including a low THC content, so as to comply with the 2018 Farm Bill. Consequently, many varieties of hemp produce significant quantities of CBD.
Marijuana seeds can be acquired from an array of sources and can vary in quality. For more info on how to buy marijuana seeds, check out our Guide to buying cannabis seeds.
For a seed to be viable, it must be mature enough to have a completely formed genetic blueprint, and it must be strong enough to germinate and pop through its hard casing and sprout its crucial taproot.
I have a very technical question regarding seed germination, and I know you are just the man to ask. I have a friend who holds a PhD in plant physiology, and he once told me that plant seeds can be “turned on and turned off,” such that they germinate at a rate of 100 percent, or not at all.
If the seeds are being difficult, you can try floating the seeds in a glass of water for a day to help soften them up. Some advanced growers even use mild soap solutions, razor blades and plant hormones to increase germination rates on old or heirloom seeds.
The Question: What Can You Tell Me About Seed Germination?
Perhaps the most well-known theory on turning seeds “on” and “off” for germination involves the flowering signal that triggers hormones in plants to fruit or flower. These same signals can also be used to trigger germination—or render seeds nonviable.
These “signals” are really the absorption of specific light frequencies.
When red light at 660 – 760 nm hits a seed and then is immediately followed by a flash of red light at 760 – 800 nm hitting the same seed, the seeds will not germinate. Reverse this process, and the seeds will germinate at a very high rate, if not in totality.
Unlike other agricultural crops (like vegetables, fruit, or grain), cannabis hasn’t undergone the vigorous breeding techniques that ensure a stable crop. This means that you’ll sometimes sow a pack of seeds technically labeled as the same “strain,” but may end up with very different looking plants. It also means that the individual seeds you buy from a seed bank can vary in appearance.
Immature cannabis seeds, on the other hand, tend to be green and have a soft outer shell that breaks when any kind of pressure is applied to it.
Appearance And Feel – Checking The Color, Size, and Shape Of Your Seeds
A quick web search will bring up all kinds of myths about how to tell female cannabis seeds from males. One of the most popular ones comes from a chart showing 5 different seeds that claims that the female seeds have “a perfectly round volcano-like depression at the bottom (from where the seed was attached to the plant).”
This is absolutely not true. As we explained earlier, cannabis seeds naturally look different, and no single physical trait of a seed can tell you whether that seed contains the genetics for a male or female plant. The only way to tell a female cannabis plant from a male is by looking at its flowers when it begins to sex. Don’t be fooled into throwing out perfectly healthy seeds just because a popular internet chart told you so.
However, slight patience is required when conducting the float test, as results are not immediately apparent. You’ll have to wait for approximately 1–2 hours before confirming the results. Some good-quality seeds will need adequate time to absorb enough water for them to sink. Use this time to go water the garden and get some much needed pruning done. Upon your return, any seeds that remain on the surface are most likely not viable and won’t be worth further time and effort.