Kelp is magic for everything to me - at least partly because it's available and free!
I have read a lot of stuff about it, and will find some of that and post it here at some point, when time allows.
As for personal experience, my first use for kelp many years ago was on the recommendation to soak (or at least, slosh) bare rooted trees or shrubs in a kelp solution before planting, to reduce transplant stress. I did have the occasion to plant some with and some without kelp. It made all the difference IMO, as those that did without were stressed, wilted etc.
I have never sprayed my tomato leaves or flowers with kelp because I don't like to spray them with anything, since the benefit of a greenhouse is to keep the leaves dry, which seems important here. I feed it to their roots instead.
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