Tindomul: When training partially grown p'bulbs, I do not tie a knot, I simply loop the raffia/wire around the far side of the p'bulb. So it forms a "U" - it doesn't completely encircle the new pbulb. It is then tied off to either a stake or an established p'bulb that lies in the direction I want the p'bulb to grow towards. I have occassionally used rubber bands as Sun rm.N.E. describes and this is a great idea, especially if you have a good assortment of sizes [which I currently don't - but I think I will go to Staples and stock up!)
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