Genetic " drift" is not an issue in asexual propagation.

There. I said it.

n population genetics, genetic drift is the statistical effect that results from the influence that chance has on the survival of alleles (variants of a gene). The effect may cause an allele and the biological trait that it confers to become more common or more rare over successive generations. Ultimately, the drift may either remove the allele from the gene pool or remove all other alleles. Whereas natural selection is the tendency of beneficial alleles to become more common over time (and detrimental ones less common), genetic drift is the fundamental tendency of any allele to vary randomly in frequency over time due to statistical variation alone, so long as it does not comprise all or none of the distribution.-wikipedia "genetic drift"

Note the specificity of "sucessive generations."

Asexual propagation- " cuttings", " clones" are re-iterations of an individual, not a reproductive generation. There is no reassortation of alles.


Certainly it is possible for re-iterations of the same individual to demonstrate variations in phenotype, due to environmental conditions in particular. I'll even posit that there can be damage to the DNA of an individual used as a source that will continue to manifest through successive re-iterations.
Many viral pathogens will cause variations in phenotype that will appear to be variations in endotype.

But it can't be actual " genetic drift"- Drift, by definition, occurs within a population, over (sexual)reproductive generations. We're talking about re-iterations of the same individual.

If you're experiancing a great deal of pheno drift when new moms move into an envionment, I'd be looking at increasingly symptomatic viral pathogens.