A quick inventory of the plants I have purchased to use at the house in an outdoor and/or container-gardeny capacity:
6 Ageratum, some blue variety
1 Bracteantha bracteata, yellow
3 Bracteantha bracteata, orange
1 Caladium 'Gingerland'
4? Caladium bulbs (don't remember the ID; unplanted)
12 Capsicum annuum (jalapeno pepper)
1 Centaurea montana NOID
1 Colocasia spp. (elephant ear)
3 Dichondra 'Silver Falls'
1 Euphorbia dulcis 'Chamaeleon'
1 Fragaria 'Fort Laramie' (strawberry)
8 Gazania 'Tiger Mix'
1 Geranium 'Rozanne'
1 Lantana 'Rose Glow Improved'
1 Lysimachia 'Goldilocks' (moneywort, creeping jenny)
1 Matteuccia struthiopteris (ostrich fern)
3 Osteospermum 'Bronze Charmer' (African daisy)
60 Portulaca 'Tequila Mix' (moss rose)
1 raspberry cane (Rubus) of unknown cv.
1 Salvia elegans (pineapple sage)
3 Scaevola 'New Wonder'
1 Sempervivum 'Red Beauty' (hen and chicks)
1 Solenostemon 'Kong Aline' (coleus)
6 Zinnia 'Profusion Fire'
plus, seeds for:
blue morning glories (Ipomoea 'Flying Saucers')
more marigolds (Tagetes patula 'Jaguar')
some variety of sweet corn (Zea mays)
cypress vine (Ipomoea quamoclit) and hyacinth bean (Lablab purpureus) (thanks, Zach!)
nasturtiums (Tropaeolum majus 'Cherry Rose Jewel')
plus a fairly large number of plants which could wind up inside or outside (coleus, Tradescantia pallida, Cordyline fruticosa, etc.). And I'm not even necessarily done buying stuff: there's been some thinking about which things to plant with which other things, and I'm realizing that most of this doesn't go together especially well, so I may "need" more. Plus, there was already stuff planted at the house. I predict that my "garden" is going to be a mess, at least this year.
The moral of the story is probably that known plant obsessives should be strongly discouraged from exploring new forms of plant-buying, and/or shouldn't work in a garden center during spring when many, many new plants are available all at once. Both of which are things we kind of already knew.