Add in the flower water a piece of potato peel and tulips will not grow high; success!
Good short cut (after all, they grow a lot through). With a pin just below the flower cup make a hole in the stem.
If they still go hang: shorten and rolled in a newspaper overnight to keep them in a vase.
For tulips to not hang no more than 1 1/2 to 2 centimeters of water into the vase so be careful that they do not become dry. Should they work to stay strong and will not hang.
To extend the life of tulips look in an old vacation wallet maybe you still French coins, 0:20 centimes, 0:10 centimes? Put it in the vase with tulips and you will see that these last longer and do not go hang!