I am in Zone 5 (Wisconsin). We maybe get a maximum of 10 days that hit 90F. Most summer days are high 70s to high 80s. Would black pots really be so wrong? (I like black.) Could they even help keep media warm in the spring and fall nights?
Are the 6+ inch tall tumblers below just too big (waste of media?)
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Bubble tumbler: 6.62 inches (H) x 3.25 inches (W)
Clear plastic, 22 ounces, has bubbles throughout. Enough to diffuse sunlight off the moss? Also comes in a 4.75 inches (H) x 3.5 inches (W) version.
Gray tumbler (also comes in black): 6.62 inches (H) x 3.5 inches (W)
Pale gray, 26 ounces. Too big? Also comes in a 4.62 inches (H) x 3.5 inches (W) version.
Green tumbler (also comes in dark blue): 4.75 inches (H) x 3 inches (W)
Just right? Also comes in a 3.25 inches (H) x 3 inches (W) 8-ounce version and a six-pack of the small size.
"Stone" tumbler: 5.5 inches (H) x 3 inches (W)
Made of thick resin, 8 ounces.
Silicone tumbler: 2.875" dia. x 4.625" tall
Heat-proof, slightly squishy, 8 ounces. More expensive. Also comes in 3.75" dia. x 5.75" tall 16-ounce; and a translucent polished 3.125" dia. x 4.125" tall 12-ounce version.