I totally agree.. you need to know color, where and also "bloom" time for bulbs! My first daffodil garden was planned exactly the same way early-mid-late blooming mixed together 17yrs ago so I always have some kind of bloom.. Well the colors didnt matter they were every variety but nothing clashed.. It's still going strong.
Now my tulips I just planted I mixed tall red with tall yellow mid blooming with shorter yellow and yellow/red mix tulips for late blooming. I know the varities and I keep a log with the company name/date ordered/priced paid along with the photo from the catolog. They all had a place to go but I tell ya my BACK WAS DONE for the year by the time I got done.. I also mixed 25 hyacinths to an area all by themselves so I can pick them for thier fragrance. I used an auger attached to a drill for the tulips but the hyacinths had to use the good ole shovel... Can't wait for next year to see them all come up..
Oh, but your back will be so happy next spring! (Sorry to be so late to answer - I was away, far away.) Sounds like you do a terrific job of splendifying your spring with bulbs! Thanks for your wise comment - you are far wiser than I, in practice.