Connect the ties between each plant with shorter lengths. You can also do it with your heel or a stick or the back edge of a hammer. Do it just before the plants spike. If the stalks are not growing straight, Canine also suggests righting them at the same time, provided the soil is moist. You might break the plant.
Gladioluses are spectacular cut flowers.
If your entire crop is destined for arrangements, try planting the corms in an unused area of the yard, such as the back of a garage. Provide plenty of sunlight and water as well as good air circulation. Harvest the spikes when the first flower begins to swell and open. The remaining buds will unfurl indoors. In making the cut, leave the three or four lowest leaves on the plant.