My dad is an ornamental fertilizer rep (think large scale wholesale) and a certified crop adviser. He recommends Dynamite brand slow release fertilizer over Osmocote. He claims that Dynamite has a far superior bonding agent and it releases at a more uniform rate than Osmocote. That can be pretty important if you're looking out for an ammonia spike. I'll give it a try as soon as my current Osmocote tabs run out.