I found it to be really good! For one of the less known/used plant foods, i found it so much better than the big names! It was uneffected by the carbon in the filter unlike other brands. Did REALLY well for plants like Cryptos (balansae especially), aponogetons, jave fern and anubias and nymphaea (sp) lilies.
just bung it in near the filter, it will stir it into the tank itself if you have a heavily planted tank, you might want to put it in 2-3 times a week but if its only a few plants then once or twice will probably do.