Good points about the slow release fertilizers releasing quickly in hot weather. They work well when weather is cool or just warm--but can release too quickly when temperatures are above 95. Plants don't need excessive fertilizer when they are struggling with the heat. That's why I don't depend on the slow release stuff for the total fertilizer needs of the plant, but apply them at a conservative rate and add soluble fertilizer as needed.
I saw the dynamite brand recently and it appeared to be good stuff--it had added micronutrients, which is rare for a slow release fertilizer. Micronutrients are often lacking in container growing.
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