The initial image was afternoon sun. The new images are full sun from dawn to dusk. You can see for yourself what color the extra photons provide.
There is full sun and then there is FULL sun.
Mine get to looking dirty as well, but after a couple years there will be a nice carpet of moss and no more probs.
Biggest thing I learned early on was no perlite for outside mini bogs... now there is a mess after a rain.
However, there is a brand of perlite that has a higher density and doesnt float, but I cant find it locally.
Thanks for the kind words,