https://en.wikipedia.org/wiki/DNA_methylation

That's about as much as I know. Genomic imprinting is specifically to do with DNA that behaves differently depending on whether it's paternal or maternal. The most famous example of this "in real life" is Prader-Willi syndrome (mentioned in the imprinting article), in which the same genetic defect causes one of two radically different pathologies, depending on whether it came from the mother or father.

I think it's worth noting here that plant genetics is vastly more complex in basically every way than animal genetics.