I've been wondering about this for a long time! Plant hormones for new growth tend to travel upwards. There are many terrestrial techniques for laying plants horizontally to get new growth to sprout from each node, rather than a single stalk growing long and skinny upwards.
I've thought that if I took a long 8" rotala blood red stem, snipped the newest node of growth, and pinned it sideways to the substrate length-wise, it would put out new vertical growth perfectly spaced from every node along it's stem. Are you saying you've tried something similar and it worked?
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