If I understand you correctly you want to make some plant categories in your profile? I don't think there is a limit on how many categories (I have about 80 so far) and you can call the category anything you want. I even have some categories for non plant items- for instance garden decor.
Click on Manage your List and then scroll to the bottom where it gives you a box to add your category. Once your category is listed and confirmed you can add your photo to it. When you click on add your photo it will give you your list of categories and you highlight which one (or more) you want it to be included in. Make sure you scroll to the bottom if you want to add any notes and to confirm your entry.
Hope this helps. Feel free to check out my list if you want some examples.
