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Raspberries multiply like rabbits, "precociously,prodigiously, and prolifically" according to Fine Gardeningwebsite. For every cane you plant one year, you can expect at leasta dozen the following year. The plants send out underground runnersin all directions to propagate.
Similarly, it is asked, do raspberries spread?
Raspberry plants get big, really big, and theyspread out. You have to provide them with room tospread a little or they won't thrive. You also have toremember that they will be there for several years.Raspberries like water, and they will grow inwhatever direction they have to, to get it.
Subsequently, question is, how do you keep raspberry bushes from spreading?
Use a shovel to dig a trench at least 8 inches deeparound the raspberry plants that you want to keepcontained and insert a root barrier. Fill the soil in around thebarrier, leaving at least a half-inch of the barrier above the soilline so the raspberry plant's roots won't grow over thebarrier.
Select a spot in full sun with rich, well-drained soil.Pick out plants that will grow well in your hardiness zone.Plant raspberry bushes 3-4 feet apart and install a post andwire system for support. Water raspberry bushes regularlyduring the summer.