Feed your bulbs now — before, during, or after they have bloomed. This helps the foliage to send food to the bulb which it will use to grow next spring’s flowers. Do NOT cut off foliage, or braid it until it has turned yellow, or you will not have blooms in 2018. Hate the look of yellowing foliage? Plant annual among them to hide it. As the flowers on your spring bulbs wilt, do them a favor and pop off their heads. You want your bulb to put its energy into producing more bulbs, not producing a hybrid seed from whatever pollen it received.
Deadhead spent bulbs so they put their energy into strengthening their bulb.