Quick Answer
To test the flexibility of dogbane cordage, twist a 12-18 inch length of freshly harvested fiber into a thin cord and then bend it 90 degrees around a smooth stick or rock, observing how it holds its shape. Repeat this process multiple times, gradually increasing the number of bends. A flexible cord should withstand at least 5-7 rounds of bending without breaking.
Preparing the Fiber
When testing the flexibility of dogbane cordage, it’s essential to start with a high-quality fiber source. Harvest dogbane stems in the late summer or early fall, when the fibers are at their strongest and most flexible. Remove any leaves, seeds, or woody material, and then split the stems lengthwise to expose the inner fibers. Use your fingers or a blunt tool to tease out the individual fibers, taking care not to damage them.
Twisting the Cord
To create a test cord, twist 12-18 inches of dogbane fiber together in a clockwise direction. The ideal twist rate will depend on the specific application, but as a general rule, a 5-7 twist per inch (TPI) rate provides a good balance between strength and flexibility. For a more durable cord, you can also add a few strands of flax or hemp to the mix.
Bending the Cord
To test the flexibility of the cord, bend it 90 degrees around a smooth stick or rock, observing how it holds its shape. Repeat this process multiple times, gradually increasing the number of bends. A flexible cord should withstand at least 5-7 rounds of bending without breaking. If the cord shows signs of wear or damage, it’s likely not suitable for use in critical applications, such as securing a shelter or creating a fishing line.
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