Q.periwinkle
How far apart to plant new plant?
Downtoearthdigs
Answered on May 9, 2016
You can plant the Periwinkle 8 to 10 inches apart for edging coverage.
If you plant closer together for a more filled in look right away, you can always move plants later.
https://www.gardeningknowhow.com/ornamental/groundcover/periwinkle/growing-periwinkle.htm
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