A witch turn three young ladies into a flower two was single and one was married so the married one was given a power to turn into a human being in the night, so the witch person went and told the husband to come and carry his wife, how would the husband know which of them is his wife

The married woman was given the power to turn into a human being in the night. The other two single women remain flowers.

If the husband comes to identify his wife during the day, all three would be flowers, and he wouldn't know which one is hers.

If the husband comes at night, his wife would have transformed back into her human form, while the other two would still be flowers. He would then easily recognize her.

Answer: The husband would know his wife by going to them at night, when she would have turned back into a human.