A pot of irises could go in the iris category, the container category, or the perennials category. I think photos should be moved only if they're in a clearly inappropriate category (an Iris in the Annuals category, for instance).
I don't think photos should be ignored if they're in a marginally "iffy" category. What if you grow only one type of plant, and you take great photos of that particular type? If you're an amaryllis addict, for instance, and you have 20 superb amaryllis photos, you could enter 5 in Tropicals, 5 in Bulbs, 5 in Lilies, and 5 in Perennials. If you have some closeup photos, you could enter another 5 in the Macros category.
