Every plant tag makes you the same offer: full sun, part sun, or shade. The tag is honest. The guessing is where it goes wrong. Most people over-estimate their sun, buy accordingly, and then spend the summer watching the mismatch play out in slow motion.
One observed day settles it. Pick a clear day, glance at the spot every hour or so, and note when direct sun arrives and leaves. Six or more hours is full sun; three to six is part sun; less is shade. The hour-by-hour method, and the traps (morning versus afternoon sun, bright shade versus deep shade, what a wall of brick adds), are covered in our light-reading care guide. This guide is about the second half: what to plant for each answer, here.
If you read full sun
Six-plus hours in a Greenville summer (often with afternoon included) is a demanding post, and the plants that hold it are proud of the fact: lantana, angelonia, purslane, trailing vinca, verbena. Build sunny planters from the heat-tolerant list and they’ll take the assignment as a compliment. Build them from spring impulse buys and August will conduct the exit interviews.
One local asterisk: full sun plus a west-facing brick wall is its own category. The wall stores the afternoon and radiates it back all evening. Choose the toughest of the tough there, use a big pot, and pull the planter a foot off the wall.
If you read part sun
The best all-around verdict a porch can get, with one crucial follow-up question: which half of the day? Morning sun with afternoon shade (the east-facing porch) is the gentlest growing spot in the Upstate, and nearly everything short of the true sun-worshippers thrives in it. Afternoon sun with morning shade is tougher than the hours suggest; treat it closer to full sun when choosing.
If you read bright shade
A covered porch, open to the sky at the edges, bright enough to read on at noon: no direct sun, plenty of light. This is caladium country: caladiums, SunPatiens, torenia, coleus and heuchera keep real color going all season, with ferns for volume. Shade planters need less water than their sunny cousins but more than people give them. A covered position also means no rain ever reaches the pot.
If you read deep shade
Dense tree cover or a north-facing wall under a roof grows a shorter list (ferns, heuchera, hosta in a large pot), and the design leans on foliage, texture and the container itself rather than bloom. A genuinely handsome pot earns its keep here more than anywhere else on the property.
Believe the reading
The most common way this goes wrong isn’t a bad reading. It’s overriding a good one because the garden center display was persuasive. The porch doesn’t negotiate. Match the plants to what you actually saw, and most of the summer’s “what’s wrong with this planter” questions never come up.