I have an Slc. Ken Dream 'Dogashima' growing in s/h. I was thrilled to get a sheath sometime last year, but it dried out without blooming. So I was very happy to see a new sheath a few months ago. (It has been growing outside since mid-May). A new growth also opened up a few weeks ago with a sheath showing. Now the sheath that I expected to produce buds any day now has also dried up. I am left with that new, 3rd sheath, but not a lot of hope for that one either!

What could I do differently and why might 2 consecutive sheaths have dried up without blooming?