Answer: The spacing would depend on the time frame you have in mind, and whether or not you are willing to wait for the plants to mature. Skyrocket requires full sun and a well drained soil, it is also an extremely narrow plant (about two feet wide at the base, sort of a stiletto shape) so it may or may not be the best choice for the location you have in mind. It would not be a good choice on the north side of a fence, for instance, or in a poorly drained clay soil. The actual rate will depend on the cultural conditions so the rate is only an approximation. You might expect it to grow a foot a year, perhaps more early on. It is never wise to plant large trees or shrubs or to dig close to underground utilities, so I would strongly suggest you double check their location prior to planting -- and the property line as well. You will also want to allow some room for any maintenance work that might become necessary to include either digging up the lines or maintaining the fence. I hoep this helps in your planning.
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