In Canada, zone 3, searching for a good fertilizer for perennials?
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Here's a helpful guide for you! http://www.greenecountyfert.com/wp-content/uploads/2014/07/Greenefield-Application-Rates-and-Time_Growing-Zone-3.pdf
Check with your extension office, they can tell you what you need and maybe test it for you to see if you need anything extra.
I like the Espoma family of products, they're organic. Also, Miracle Grow.
I mostly use Miracle Grow extended release so I don't have to constantly reapply it. Grass clippings and shredded leaves for mulch also help with adding nutrients.
I use Miracle Grow.