Gladiolus flowers not appearing

Though the gladiolus plants are flourishing, no gladiolus flowers have appeared.
Sometime ago, nurserylive had a good offer for gladioulus bulbs and a total of 20 gladioulus bulbs were ordered.
Out of these three bulbs were sprouting when it was raining heavily, so they were planted in pots.
However after a few months, though each plant has 5-8 leaves each, no flowers are appearing for any of the gladiolus plant
The plants are being watered almost daily, yet no flowers are appearing.
Any tips to fix the problem and make the gladiolus plant flower will be appreciated.