Sorry to hear about your first loss.
I have a Den. laevifolium, which is similar to the cuthbersonii. I, too, heard that cuthbersonii is a bit difficult to grow. So I bought the laevifolium. My blooms lasted about 4 months! The last bloom fell off a few weeks ago. Several days ago, I noticed a bud forming! Check it out.
IOSPE PHOTOS