The distance depends on the kind of plant, and the look you want. If you're starting from seed, the height and width of mature plants should be printed on the seed package; size information should also be on the tags of plants sold rooted. If you want open area around the plants, plant them wider than the projected width, e.g. 8" width could be planted 10", 12" even 15" apart. If you want a solid swath of plant, set them a little closer than the projected width, e.g. 8"width could be planted 8" - 6" apart. This article has some more information: https://www.gardeningknowhow.com/ornamental/flowers/fgen/mass-planting-ideas.htm
Answered on September 12, 2014
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