How would I change the properties of multiple parts at once?

So to sum it up, I've got a model called Flower with a lot of parts, and I'm trying to make all of those parts invisible when they're touched at once but it doesn't work.

(Here's my script)

function onTouched()

        Parent.Parent.FindFirstChild("Humanoid")
        if humanoid ~= nil then 

    Workspace.Flower:FindChildren.Transparency.new = 1

end

end