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Why plants like hibiscus and banana tree have flowers and pollination takes place, but they have no seeds?

I have seen plants in my garden which have flowers with bright petals, nectar and pollens but no fruits or seeds. What could be the purpose of flowering? Some plants don't flower, no fruit/seed either; like crotons. How did they manage to multiply and disperse?

Public Comments

1. Banana is a triploid plant. They do not produce seeds because of imbalance meiotic division. Hibiscus is a bisexual plant. They do not produce fruit and seeds possibly because of pre- and post- zygotic barriers (barriers before and after fertilization). These barriers could be on stigma, style, or self-incompatibility between the male and female gametes. You might overcome these barriers using stigma pollination (by cutting the stigma), placental pollination (cutting the ovary), ovular pollination (placing the ovule on medium and directly pollinated with pollens), or by embryo rescue. Some (flowering) plants do not produce flowers, fruits and seeds. They reproduce and disperse vegetatively using rhizomes (ginger), bulbs (onions, tulips), sucker (banana) etc, or by man made: cutting, grafting, budding, etc.