Yeah You can. I like to let mine die all the way back when the Plant is fairly new. Ebay is a good place for root tabs.
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Here is my sword when I first put it in. it browned so much that I thought I would have to throw it away. over the course of about 4 Monthes I split the plant into 3 all are the size of this one. another month or so I will split them again and have 6 plants this size, about 24" from root to crown. Also leave any runners on as long as possible.
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