As I mentioned earlier, I just rub the anther on the style and
call it good (I pull the whole stamen off, and hold one end between my
However, I've pollinated quite likely millions of flowers of cacti and
other succulents. For those there are many methods, but for the average
flower a tiny paint brush works best. One that is natural fibers holds the
pollen better than smooth nylon, but you have to experiment to find the best
ones. You can often buy a dozen for a dollar, usually more, but never
expensive. I would think these would work perfectly well for Iris too,
since there is no significant difference in the process, only that the styles
are shaped differently.
For Cactus and Iris both, I've also just rubbed the pollen onto the end of
my finger and then rubbed my finger on the styles. This is a bit tricky on
an Iris though, the style is hard to get at with a big fat finger. It's a
bit tricky for a long-spined cactus too - for other reasons.