Huum! Greg we appreciate each others plants but forget to ask some relevant questions. To much nitrogen reminded me that I grow mine is a sand and gravel mixture, if any soil is in there it is more due to negligence and not design. Just a light 1:1:1 ratio (14:14:14 fert I round of and consider 1:1:1) feed of fertilizer in the blooming season. Like cactus I think these are also getting their nutrients from atmospheric moisture.
Regards,
Arif.
