Hi Rythen,

I also purchased one of the small H. blumenavium and have it growing in conditions similar to the griffinia; warm, semi -shade with high humidity. I use my regular potting mix of potting soil, sand, perlite with added ironite and under these conditions it continues to put out new leaves and I have not had any leaf drop. Since you are probably growing inside this time of year in your zone, your conditions might be dry enough to cause leaf drop. You might try increasing the humidity by filling a container with pea rock, adding water to a level below the pea rock and placing the pot on top. It is a little more difficult this time of year when temps are low to keep humidity high without rotting the bulbs. So be careful to keep the water level in the container low enough that the pot can't wick up any of the water in it. Let me know if this helps. - J