Well, now I know, Delosparmas really like it on the balcony. All of the below plants have overwintered outside in the cold and are now enjoying direct unfiltered sunlight. No burns and lots of flowers and flower buds. I'm seriously thinking of moving all my Delospermas out there permanently. Except for D. sphalmantoides. And the "bonsais", I suppose. And D. harazianum is flowering just fine on the windowsill after a warm winter. But otherwise, these guys do enjoy fresh air :)
Delosperma sp. A variety called "garnet", I think.
Delosperma sp. A variety called "moonstone".
Delosperma lineare "golden nugget"