I don't fertilize the first year in the life of a manured and compost bed, but I do in later years.

I use granular FALL (not summer!) grass fertilizer, it is inexpensive and I use it all over my flower beds, trees, etc. I buy it in the fall because it's the only time it's available. I spread it in the spring and summer of the following year.

I use a mostly organic granular fertilzer in the spring and again in early fall. It's called BulbTone, made by the Espoma company in NJ. Being mostly organic it doesn't kill the benneficial organisms in the soil like some other fertilzers can do. I use it for all my perennials.
Newly planted plants will get some root stimulant in the first one or two waterings as well.

Kim

I fertilize in the spring with Plant Tone or composted dried manure. This time of year after bloom when the daylilies are looking pretty ratty, I usually hit them with a nice dose of Neptures Liquid Seaweed Fertilzer. This year I am going to be digging and moving so many that I don't want to fertize them until its done.