Commented: mixed coleus locationI've never grown black coleus, so I'm not sure about its light requirements, but I expect it would be the same as other coleus.
Commented: Annual for partial shadeI suggest a taller-growing coleus, such as Rainbow Mix. If you buy a market pak of four or six plants, you'll get a nice variety of colors, and they'll look great in your cinder blocks.
Or,if you'd ra...
Commented: annuals for 2+ hour sun only dailySalvia might work. It grows about 18"-24" tall, and doesn't need a lot of sun. The variety I like is called "Victoria Blue".
