I have two rose bushes that are close to each other and about 10 years
old.
A few months ago when rose bush 1 started to flower I noticed that the
buds were different from the rest of the plant. Few days past and I
noticed that the new buds on rose bush 1 were the same as rose bush 2.
Sure enough when the bud opened the flower was identical to rose bush
2 and very different from rose bush 1.

No grafting has been done (or any other human intervention) to these
plants ever...

Could anybody suggest a reason for this????


Is it possible that the buds cells producing the seeds were mutated
and instead of the hard shelled seed being created, the mutated cells
expressed the genes to initiate stem growth - creating a different set
of genes in this new stem?