Here's my thinking: the custom data fields were designed because some plants have unique characteristics that are separate from other kinds of plants. For example, most plants don't need to have ploidy indicated, but in daylilies it's very important so we have it there.
At this point, asking for the same fields in 24 different custom databases tells me that these fields really should belong in the primary plant details.
Hybridizer should be a universal field among all cultivars. Nearly every cultivar has a hybridizer that could be listed. Same with history and year introduced.
Heredity is universal among all vegetables.
I propose we make all these fields primary fields, and that I then phase it out of the databases that currently have it in their custom architectures.