Gladiolus Flower Bulbs - Black Star

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These came up, but there were absolutely no blooms, and I think it was because I did not plant them deeply enough. I'm hoping that next year they may come up and bloom but any advice would be appreciated. They look absolutely stunning in the picture.

Black Star Gladiolus

They are growing in a container. They look really healthy. But they have not bloomed yet. I planted them late - since I bought them on sale.

No blooms :(