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Eve - they're perennials which means that you start them off this year and they'll flower next year - in the case of wallflowers they'll flower next spring - so far it sounds as if you've done everything right
They'd look lovely with tulips planted between them. How do you mean - separate them?
Don't separate tulip bulbs Eve. ,plant them individually 5" or so deep. Have your wallflowers flowered yet? If not they will in spring. Best to dig them up after flowering in spring and put something in their place for the summer.
I planted mine now and I planted them in a deep hole and watered well,although the weather saw to that! I have spaced them well out a as they bush out,but i want a carpet affect.