1) [6, 7, 8, 11]

2) [6, 6, 7, 10]

3) [6, 5, 6, 9]

4) [5, 5, 5, 8]

5) [5, 4, 4, 7]

6) [4, 4, 3, 6]

7) [3, 3, 3, 5]

8) [3, 2, 2, 4]

9) [2, 1, 2, 3]

10) [1, 1, 1, 2]

11) [1, 0, 0, 1]

So you can have 2 petals remaining.

It is impossible to have less than 2 petals remaining, because there is a total of

: 6 + 7 + 8 + 11 = 32 petals.

Each time you pluck one petal each from 3 flowers, you remove a total of 3 petals.

After 10 steps, you remove a total of 10 × 3 = 30 petals.

You can't remove any more, because 32 - 30 = 2 petals remaining.

There can be no next step because 3 is bigger than 2.