Dont use chemical repelants on your bulbs (they could be bad for the environment), enclose bulbs in chicken wire so the squirrels cant dig them up :) I don't think the iris needs protection.

The repellant I'm using is made from garlic, so I don't think it would be bad for the environment. Chicken wire is more trouble than I want to go to. I overplant bulbs and would always be running into it. I know DH would just yank it out the first time he ran across it while digging.

'which bulbs need squirrel repellent?"

From your list, neither.
At first I was somewhat hesitant about brodiaea as I remember disturbed soil in a general area, but then recall planting crocuses there. All other brodiaea plantings were not disturbed, so I think they are out of squirrels interest.

I would need to hire Santa's helpers...by the dozens...if I wanted to plant my tulips in nifty little wire cages. We'll frequently put 2-3,000 in each Fall...along with hyacinths, crocus, fritillaria and camassia.

I shoot any little b******* that get near my garden.

I dig a hole, sprinkle a bit of baby powder around , plant the bulb, then sprinkle a bit more powder at the surface. This works for almost anything. Any time you disturb the soil, squirrels are curious and dig around , at least that is my experience here. I use the baby powder when I plant perennials as well. How many times have I found a perennial uprooted shortly after it was planted?

I heard about the baby powder/ talcum powder application from a local arboretum. Just be certain you are not inhaling the powder.

Baby powder! Wow! So much easier than what I have been doing! I know talcum, or talc, is actually a mineral. Can it be any baby powder or only the ones made from real talcum? Some are now made without talcum.

Thanks so much!