I have 22. That's types of plants where I have to have every new one that comes out. I did stop at 1200 on daylilies cut back to 800 on iris, though. I have way more than i can take care of. It's all spread over 10 a res and i don't have a sprinkler system. We've lived here 3 yrs but i've gardened with passion since i was 10, and some plants have moved with me from house to house.
Roses 400
Hosta 200
Peony 75
Clematis 75
Lilium 150 that have nametags
Shrubs! I love shrubs! Especially viburnums, lilac, hibiscus, crepe myrtle
japanese maples
Grasses and i even keep them labeled
citrus
Water lilies
Dianthus, echinaceas, sedum, salvias, hoya, coleus, philodendron and my first love, African violets.