Fertilizers are all different...the best bet is to use an even lower strength than is indicated on the packaging. "Fertilize weakly, weekly" is a blanket statement...Basically what you want to do is give low concentrations of fertilizer solution for three consecutive waterings, then flush with straight water on the fourth. And be sure that the roots are premoistened before fertilizing. This does two things- firstly, it reduces the chances of fertilizer burn and secondly, helps to ensure that the roots are receptive to the nutrients.
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