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Some folks will tell you that there is no such thing as an IBL.
My opinion differs, however, and common sense tells me that there are tons of IBLs.
That label, however, means next to nothing in the cannabis industry. In my eyes, the way it is used, is to denote some breeding was done within a line.
The term, as used within the cannabis industry today, really has nothing to do with stabilized, true breeding lines.
Not many of today breeders work the same lines year after year after year, locking down desirable traits, in order to release their work. If the work is done, it is typically kept, by the breeder, for future breeding purposes.
My opinion differs, however, and common sense tells me that there are tons of IBLs.
That label, however, means next to nothing in the cannabis industry. In my eyes, the way it is used, is to denote some breeding was done within a line.
The term, as used within the cannabis industry today, really has nothing to do with stabilized, true breeding lines.
Not many of today breeders work the same lines year after year after year, locking down desirable traits, in order to release their work. If the work is done, it is typically kept, by the breeder, for future breeding purposes.
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Me too, me too, me tooooo 
Seriously, MJPassion put it down quite nicely: The true definition of IBL as used in biology, farming, or animal breeding has nothing to do with the cannabis IBL.
Every halfway 'stable' cannabis cultivar/hybrid/selection which shows some homogeneity in its offspring gets that term. Scientifically speaking, only selfing, sibling crossing (best used with proper selection), backcrossing to a parent which is already an IBL, production of doubled haploids, and a few fancy bio- and gene technology strategies lead to true IBLs. Using open pollination will, without strict selection maybe based on genetic markers and a rather small population, never result in an IBL.
Such strong inbreeding is not favourable with cannabis; what might be done is selection. The generations to obtain a true breeding plant ('true breeding' only with regard to the desired traits if these are homozygous) increases as follows: selfing < back-crossing to a plant which already expresses the desired traits < filial breeding < open pollination.
We had that topic several times already and the techniques and all are well explained there .
If the trait you seek were monogenetic and dominant, then an F2 might already be 'true breeding' and result in 'stable' hybrids.
Seriously, MJPassion put it down quite nicely: The true definition of IBL as used in biology, farming, or animal breeding has nothing to do with the cannabis IBL.
Every halfway 'stable' cannabis cultivar/hybrid/selection which shows some homogeneity in its offspring gets that term. Scientifically speaking, only selfing, sibling crossing (best used with proper selection), backcrossing to a parent which is already an IBL, production of doubled haploids, and a few fancy bio- and gene technology strategies lead to true IBLs. Using open pollination will, without strict selection maybe based on genetic markers and a rather small population, never result in an IBL.
Such strong inbreeding is not favourable with cannabis; what might be done is selection. The generations to obtain a true breeding plant ('true breeding' only with regard to the desired traits if these are homozygous) increases as follows: selfing < back-crossing to a plant which already expresses the desired traits < filial breeding < open pollination.
We had that topic several times already and the techniques and all are well explained there
.If the trait you seek were monogenetic and dominant, then an F2 might already be 'true breeding' and result in 'stable' hybrids.
From a rather quick glance at the definition, it seems to me that once you take some seeds from a landrace source and grow them in your garden far away from that source, they're already not landrace any more, by definition. It evidently isn't just about genetic traits and homogeneity etc., it's a cultural situation. "Heirloom" seems more like what we're talking about in the garden.
Also some discussion about the subject here: https://www.icmag.com/ic/showthread.php?t=308891
