Planting perennials

I haven't been able to find any information on what one should actually add
to the mix when planting perennials.  There is a formula for roses that
includes epsom salts, bloodmeal, superphosphate and some other things.  I
have been been tossing compost or composted cow manure, peat moss, a handful
of superphosphate, a handful of epsom salts, some bloodmeal into a
wheelbarrow and  putting digging that into the soil under the perennial that
I am planting.  I just bought some B1.  I have NO IDEA what I am doing - if
it is appropriate, too much, too little. etc.

What do other people do?

Thanks.
Margot Kane
Zone 7

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