Just as with common flowers or other household plants (roses, pea plants, etc...), Cannabis seed strains can be grown and crossbred. This is usually done for the purpose of developing new breeds with different characteristics such as the size of the plant, yield, taste, effect, bud to leaf ratio, or other specific traits that the grower desires. As this cross breeding continues, the plants end up forming different weed strain seeds, or generations. These are often described as being either F1, F2, or F3. In order to really make some informed seed purchase decisions it is very helpful to understand the differences between these various seed strains.
This means that the F2 seed strain will have three tall plants and one short plant. So, the main difference between the F1 and F2 varieties is the amount of genetic variation and purity of the seed strain.
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F1 Seeds: The First Breeding:
An F1 seed variety is created by breeding together two pure strains. For example, a tall plant (represented with two dominant genes, AA) is bred with a small plant (represented by the two small recessive genes, aa). Since the resulting plants will each receive one gene from each parent, this will result in offspring with the following genetic make-up: Aa. All four offspring will have the same make-up and therefore, will each be tall plants. The difference from the parent generation in this case is that these will not be pure strains due to the presence of the recessive (short) gene.F2 Seeds: The Breeding Continues:
To create what is known as an F2 strain, the grower will breed two members of the F1 family together. The 'children' that result from this breeding will have the genetic make-up of: AA, Aa, AA, and aa. This is illustrated in the table below:This means that the F2 seed strain will have three tall plants and one short plant. So, the main difference between the F1 and F2 varieties is the amount of genetic variation and purity of the seed strain.