How many plants

If Blue Star Creeper (Laurentia Fluviatilis (Isotoma fluviatilis) plants are to be spaced 8" apart, how many plants will I need for a 300-square-foot garden?
Also, how many "plugs" of this groundcover are in a nursery flat?
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wrote:

I'm not good at my "goesintas" but I think 675...I think
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