Taking stem cuttings can be satisfying but often fails when cuttings sit in water without rooting or collapse in soil. A popular method uses a raw potato to keep the cutting hydrated and provide nutrients as the potato breaks down. Some claims also attribute rooting benefits to salicylic acid in potatoes. The method involves inserting a fresh cutting with at least one node into a potato, then planting the potato and cutting together in soil, watering lightly, and using bright indirect light. A rose cutting collapsed, while a pothos produced limited root growth. Evidence indicates potato salicylic acid may suppress root formation, making clean cuts, fresh water, and good light more reliable.
"Potatoes do contain salicylic acid, but research suggests it actually suppresses root formation. A clean cut, fresh water and good light still remain the most reliable route to propagation, no vegetables required."
Read at www.theguardian.com
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