As long as you have good drainage in your iris beds you should not have a problem with all the rain . All of my iris beds are raised about 8 inches above ground level - ( this is the best way to insure good drainage ) As for fertilizing - Are your new iris beds planted in virgin soil or are they planted where other plants once lived ? If you planted in virgin soil you might not need to fertilize for 1-3 years . Since you added compost & bone meal to your beds before planting I would not add any fertilizers this year - to much fertilizing can create many problems . I would wait till next spring & give them a little 5-10-10 when the new growth is about 4-6 inches tall & then about a month after bloom give them a shot of bone meal . Every iris grower has there own fertilizing program . The 5-10-10 - bone meal program is what I use , with wonderful results . But the best way to find out what your irises need to thrive in your soil is to get it tested .

Irises are so easy in the PNW, as long as you have decent soil and good drainage you shouldn't need to do much else for a few years. Remember not to overwater when the summer dry season comes. Water deeply once a week or so and no more for best results. Hot and wet don't mix for bearded iris.

Nice to see another northwester here! =)

Mike