Anyone know what the mineral composition of seaweed, specifically SM3 seaweed extract, is? I've just stuck some bits of hardy geranium in pots with narcissus planted round them, & I want to feed the geraniums without using something high in nitrogen, as narcissus don't like nitrogen. Chase organics, where I got the SM3, say it's suitable, but don't know or won't tell what the composition is, which leaves me a bit dubious. I'd rather risk killing the geraniums by not feeding at all than risk killing the narcissus by giving something high in nitrogen.