Any time the genetic material is restricted, it can be problematic. That is perhaps the greatest disadvantage; however there are certainly many advantages, including the preservation and continuation of well-adapted genotypes, disregarding potential sterility, and it’s possible for one individual to colonize by itself. Additionally, it makes sure that the seed will be set regardless and virtually guarantees short-term success.
If the plant is the last of its kind in a given area, it can potentially save an entire species.
Still, most plants have evolved mechanisms to prevent self-pollination because, as ajbry inferred in his answer, it is undesirable in the long-run (see link below).
The offspring will be tuffer because it will inherit the same geanes.
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