It's more accurate to say that plant genome sizes vary over an incrediblely larger range than that found in other eukaryotes, than that plant genomes are inhere

It's more accurate to say that plant genome sizes vary over an incrediblely larger range than that found in other eukaryotes, than that plant genomes are inherently large compared to animals'. Plants can have quite small genome sizes as well as giant genomes. The large genomes are in large measure due to the fact that plants typically can duplicate their entire genomes (leading to polyploidy) or large elements of their genomes, with no ill effect. Animals typically don't survive massive genome duplication.