After determining the mature size of each variety, add the diameters of each plant, and divide by number of plants. Example: if all 3 plants you've chosen will have a mature diameter of 8', plant then 8' apart if you want a hedge look, or 10' apart if you want them to have a little room between them. If you have one plant that will be 6' and another at 12', they should be spaced on 9' canters or further.
Answered on October 13, 2013
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