I knitted in stochinette untill I had 50 stitches in each of the ten sections.
The border is Flowers in a Row pattern. In the first row of the pattern (purl across) I added one stitch M1 at the end of each section to end up with a multiple of 6, 510 stitches in total.
For instructions on the edging pattern see this video: https://m.youtube.com/watch?v=jG1GbXV17XU

Please pay attention that the instructions are not for working in the round. So when she says knit on the wrong side you should purl because we are working the entire pattern on the right side.
To make it easy: the entire pattern is worked by purling including the flower stitch.
Also, pay attention that in the round you do not need the +1 stitch because you go back to the first stitch at the end of the row. So work only in multiples of 6.