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willow tissue contains a low level of indolebutyric acid, a rooting hormone. aspirin is the acetylated form of salicyclic acid which has little or no rooting hormone activity, there has been a lot of research on this subject. what aspirin does do in some plant is stimulate the production of anti-bacterial proteins. other studies have shown that the addition of willow bark had no significant effect on rooting, in other words water without bark rooted as well as water with bark.

using willows capsules will depend upon how the herb is manufactured; if it is sterilized with heat it will most likely destroy the rooting properties.

another thing to keep in mind when water rooting, the roots formed in water have a lower survival rate when planted in soil.