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Re: Does seaweed act as a growth stimulant?
It does encourage growth of all sorts, even at the microbial level. I've used it in water for rooting and by time the cutting was ready to move on (2 weeks?) there was some fuzziness to the root ball in the water; so it is a concern. I think the benefits may outweigh the risk if it's monitored and maintained. Like anything, start with it slowly if you try it. Various manufacturers advertise seaweed extract for use in hydroponic reservoirs.
With this particular plant the roots sprang forth exuberantly and when it went into soil it took off and never looked back. In a hydro setup I've read about roots turning a light brown since the solution is similar to tea and can stain.
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