1.   He happily let wild plants multiply in the lawn around his own house.

2.   Plants multiply easily if flowers are allowed to remain until the seedpods burst.

3.   The plants multiply and are especially attractive interplanted among various ferns.

4.   The plants multiply rapidly.

5.   The tetraploid plants must then multiply to build up breeding stock.

6.   The two plants have now multiplied into five plants.