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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.

It’s important to only conduct this test if you are planning to germinate the seeds immediately afterwards. The viable seeds that sunk to the bottom of the glass will have taken in water, crossing the membrane of the seed and signalling that it’s time to come to life—activating germination.

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).”

Conducting The Float Test

The one true method to test the genetic potential of a seed is to simply put it in the soil. It won’t take too long to see the results. This option is best for the hobby home grower who has time and space to spare for a risky project. Growers cultivating cannabis for commercial use likely don’t have the excess time to invest.

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.

This simple and cost-effective method is a great way to tell the good genetics from the bad; they will sink or swim, literally. Seeds that remain buoyant on the surface are more than likely of poor quality and are to be discarded. Seeds that sink to the bottom like a botanical cannonball are probably healthy and should be germinated.

If you are still unsure about the quality of your seeds after analysing their appearance and toughness, it’s time to put your lab coat and goggles on. Well, not quite. This test is extremely easy and only has two possible outcomes. Fill up a drinking glass or glass jar with water (preferably spring or distilled) and place your seeds on the surface.

Plants grown from seed develop stronger root structures.

The embryonic plant protected by an outer shell, formed when pollen fertilizes the female plant. Marijuana seeds are ready to plant and grow once they successfully germinate, or once the root has broken through the seed. They can be found in multiple forms; regular, feminized, and auto-flowering. Home growers of cannabis often choose to grow feminized seeds to ensure that the adult plant will be a flowering female.

More about marijuana seeds

Photo by: Illustration by Weedmaps

Cannabis seed production begins with the pollen grain of a male plant. From this grain, a pollen tube grows, producing male generative cells that disperse in the form of pollen. The migration of pollen into a female plant ovule triggers pistils to fall off and seed production to begin. The bracts, which contain the ovule, will then fill with seeds.

In 1982, Indian breeders made a major advance in cannabis botany with the development of the feminized seed. The key difference between feminized marijuana seeds and regular marijuana seeds is that feminized seeds have been engineered to produce exclusively female plants, whereas with regular seeds you can’t really predict if the mature plant will be male or female. This matters for cultivation since smokable flowers are produced only by female plants. Further, a male plant can potentially ruin a harvest if it pollinates nearby female plants, which produces flowers full of seeds.