Q.What Is The Maximum Distance You Can Plant Creeping Jenny?
All the articles I’ve read tell you the minimum distance you can plant CJ, but they also say it spreads very quickly. So, I’d like to know the maximum you can plant them and still have it eventually cover the area. I have a 25 x 20 area I would like to fill in (500 sq ft). If a CJ plant only takes up four square feet, that would mean I would have to buy 125 plants. At $4/plant, that would be $500. Thanks so much for your time!

Certified GKH Gardening Expert
That will be the ideal spread. They will get around 18 to 20 inches in length, so planting within that will prevent empty spaces, or overcrowding. Plan for them to get between 15 and 18 inches long for the best results.
This collection of articles will help:
https://www.gardeningknowhow.com/ornamental/groundcover/creeping-jenny