While doing organic research, I found this tidbit
Seaweed
"Gatorade for the Garden." Seaweed has been used by farmers and gardeners for hundreds of years. Here at The Natural Gardener, we recommend it for helping transplants survive and prosper through transplant shock, for encouraging more blooms, for encouraging fruit set on tomatoes and other fruits, and for helping plants to resist diseases and pests. Research has proven that regular application of seaweed can help thwart powdery mildew fungus and the spider mite pest.