Perenial spring, summer and fall blooming plants for sunny garden
by Gretchen
(McVeytown, Pa 17051)
Doug says figure the "average" perennial takes up 1.5 square feet of space at 3 years of age. So you have 135 square feet of garden. So without knowing what you want to grow - this is the rule of thumb.
So "roughly" 90 plants will fill all that space within 3 years.
Having said that - if you want it to fill faster - then you either have to plant more or use plants that grow quicker or start with larger plants (bigger pot sizes). And then plan on digging/dividing and removing them as they grow and meet each other in year three.
If you don't mind waiting a bit - you can get by with fewer plants.
Or buy larger 2-gallon sized perennials instead of 4-inch pots.
Hope that helps.
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