Thanks for the tips, Rick and Lorn. I pollinated the second or third flower on this stem (five total), but mainly used the other 'Tiger Babies' I've got instead since this one was a bit odd. I was just checking things this morning when I noticed it looked a bit odd, so had a closer look. Generally I've tried crossing with the first few blooms to open, as I've gone with the approach that if I stuff it up or the flower is damaged, then there's usually a spare one or two. It's my first year making crosses, so I'm keeping notes to see what works and what doesn't.