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Don't touch the lilac or the magnolia, or you will lose next year's flowers. I've never grown passion flower, so will leave that for someone else to advise on.
Passion flower I pruned every year in autumn or early spring. Cut it back by half without going too far into old wood. However, it became a bit of a thug here so it was removed. Tempted by some of the tender varieties though as they could survive here