Almost as a matter of rule, I plant at least doubles. It started out with me just sowing multiple seeds per hole, and having fantastic germination success. But now, I just prefer the density of a cluster.
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I've done braided plants, Abraded and fused plants, even multi-layer plants, using multiples. Lots of interesting things you can do. When you abrade and fuse, you can build some monster mass on your plants, in a very short time. Great if you have a multi-year plant, or want to make a bonchi.
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So no problems at all with multiples. Â