Tricky Puzzle

It moves without wings, between silky strings, It leaves as you find, it’s substance behind.
What is it ?

Once upon a time there was an evil magician. He took 3 women from their homes and turned them into rose bushes that looked exactly alike. He put them in his garden. One of the women had a husband and children and begged the magician to let her see them. He agreed. At night, he brought the woman to her house. In the morning he came and took her back. On same day the husband decided to go rescue her. So he snuck into the magician’s garden. He looked at the 3 identical rose bushes trying to figure out which could be his wife. Suddenly, he came to know and took his wife home. How did he know which rose bush was his wife?