I've used this before and been happy with it for potted plants: https://www.amleo.com/osmocote-fertilizer-15-9-12-slow-release-8-to-9-months-50lb-bag/p/159128/
Says 1 to 5 bags for $99.99/50lb + $27.99 shipping for 1 bag to my zip.
Vs. 1 bag 8lb amazon $14.86 + free shipping if 2 bags or greater. buying amazon multiple bags comes to 50lb for $92.875 using ratio & breaking small bags open. However the plus bag Does say reapply every 6 months (says polymer coating) & has minerals vs. regular bag without minerals reapply every 8-9 months (says encapsulated within multiple layers of polymeric resin). Unknown if same or different resin coating but similar sounding.
Presently much cheaper to buy 2 or more 8lb bags from amazon on price alone & especially with free shipping and added minerals (if desired).
The 40lb bag of HD Vigoro citrus/avocado on 40lb size recommends fertilizing more frequently so not so slow slow release vs. other 2 choices::: When to apply: apply every 4-6 weeks during the growing season for in ground plants and every 3 months for potted plants (funny being longer for indoor so I guess sunlight or moisture from daily dew breaks down the slow release characteristics faster on this choice...............Then again, leave the pots outside & complain when it doesn't last 3 months... ha.......Then again, maybe pots are part of the slow release function per the manufacturers home depot listing and you must buy them separately...
ha )
https://www.homedepot.com/p/Vigoro-40-lb-Citrus-and-Avocado-Plant-Food-162125/203089345 .......And the deal Clincher listed to sway your purchase of Vigoro is "Use around other plants: safe to use around other plants"....
We all sincerely hope soooo....