I would do clusters based upon height. Will they encroch? that all depends upon how happy they are...smiles.

I like Ductch iris and grape hyacinths. The gh's come up much earlier where I live and the DI follow later. The tulips should appear somewhere in between. nature choreographs things for a long show...if the varieties cooperate.

Look at it this way, watch them this year. You'll see who shows up when. After they foliage is done, you can rearrange. I've never found bulbs to battle, but I live in TX and we'd just love them to multiply more.
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Ok, we will see in the spring what the results are. My almost 3 year old granddaughter "has" to help Pap Brian, so we planted about 150 bulbs yesterday afternoon. I would get the trough dug and place the bulbs, and then she would move them around. I finally gave up and just covered them up where they stood.

We are in nothern West Virginia and it was 42 degrees when
we planted yesterday. Too cold for this old-fart, but it might be worth it in the spring :-)

Does anyone know how to attach a picture to a posting?