Part sun usually means 3 to 6 hours of direct sunlight, and needs some direct sun to perform well.
Plants labeled “part sun” often prefer several hours of sunlight, including some afternoon sun, but do not require a full day of direct sunlight exposure. These plants are a good choice for spaces that are not in direct sun for long periods but still receive consistent sunlight.
Some perennial species which thrive in part sun are Butterfly Weed, Wild Bergamot, Sweet Alyssum, Jacob's Ladder, Beard Tongue, Lady's Mantle and Turtlehead. Here are the Plant Club's best-selling plants for part sun.
Quick tip
If you are unsure which category your space falls into, observe what time it receives direct sunlight throughout the day. Morning sun is typically softer and suitable for “part shade” plants, while afternoon sun is stronger and more suitable for “part sun” or "full sun" plants.