Just so we're all on the same page...I use the time released in conjunction w/my regular liquid application and I usually only use it in the Spring/when new growth begins. The goal being to "feed" as heavy as I can and push as much growth as possible during their active phase but to do it w/out creating a lot more work for myself. I just sprinkle it on the top of the pot. If I wasn't so lazy I could probably create the same results by doing a dilute fert every time I water this group but to do that would mean extra work for me. So...time released to my rescue.
I haven't used the Osmocote...at least not that I can recall. I like Dynamite because it contains the necessary micro-nutrients...not just the macros. If Osmocote has those too then I'm sure it's fine.
The other reason I like Dynamite is because of the 9 month release. Although I suspect it doesn't last quite 9 months because of the frequent watering and constantly moist conditions but it's most likely fairly close. W/the 4 month stuff I would have to remember to reapply half way through the season and I know me...that won't happen. Lazy AND forgetful.
FWIW - I would not use a time release fert going into the fall because you will soon want to start reducing the fert/water as they head into their dormancy period. The product feeds at a steady rate for 4 months...and w/the start time being late August it means extra fert into Dec...which is usually a time when these guys are starting to shut down. Many will have already dropped their leaves and gone dormant. Probably not the best time for extra fert. I don't know that it would hurt anything but I wouldn't do it. I would just do the regular fert and hold the time release until they break dormancy.
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