Heres what the internet says about the subject Moses.... I have never used the two together... But Alaska Fish seems to be a good fertilizer & I have used that...

Alaska Fish is more complete than Seaweed...

• Reduce the dose: Since Osmocote is already continuously feeding your plants, cut the Alaska Fish Fertilizer dilution down to half-strength (about 1 tablespoon per gallon of water instead of the full 2 tablespoons). [1, 2]
• Frequency: Apply the diluted fish emulsion less often—every 3 to 4 weeks—rather than the standard bi-weekly schedule used for unfertilized soil. [1, 2]
• Watch for overfeeding: Look out for signs like dark, curling leaf tips or sudden salt buildup in container plants, and back off on the liquid feed if growth looks overly lush or burned.

Thank you, Jim. Advice well taken. Thanks for alerting me to the warning signs of overfeeding.

I thought that if all things were equal that seaweed fertilizer would be preferably used because of the nasty smell of fish emulsion. But if nutrients in fish emulsion are superior, then fish emulsion is the ticket.

Moses.

You can still have nice roses without all this feeding of complicated, stinky stuff. Roses only take up the elements and compounds they need. The rest of the stuff that's dumped on a rose becomes soil pollution--or some is washed out and pollutes water. My roses haven't been fertilized since March. They received a dose of Plant Tone in late February, and a dose of Lilly Miller organic granular fertilizer in March. And that's it. They're still blooming right now. Diane

I have used the Alaska fish fertilizer and it is indeed terrible to smell and seems to attract the local wildlife. I won't use it again. I've been told that Neptune's Harvest with added seaweed is the better option for plants and smells less but I've not tried it yet. I probably will at some point but I have to agree with Diane that a couple doses of Plant Tone or the like seems good enough for me, along with some compost.

Fish has been used as fertilizer for 1,000's of years. It feeds the soil, the plants take up what they need from the soil. I use Alaska Fish twice a season at half strength. Once in early May and once in early September. Using a 2 gal watering can (I have a couple of them), two table spoons of fish. Established bush's (2+ years in the ground), a full 2 gals per bush. Young bush's and potted roses, get 1 gal per bush. Potted flowers, ferns and anything else in some sort of pot get about a quart per pot. In my garden, it makes a difference I can see. Especially with the foliage. It's a little bit of work, but for me, it's worth it.

Claudia, you reminded me that I apply compost to my garden and roses once a year in November. Then a few months later in late winter-early spring comes the two doses of fertilizer. Very easy. And I'm nearly 81 years old, so anyone can do my simple rose regimen. Diane

Moses, I doubt you need it, but adding FF (Alaska brand, amazon) wouldn't hurt but you are probably wasting money.

All of your responses confirmed what my guts were telling me, and I am very appreciative of your responses. If it isn't broken, why fix it?

I switched to feeding ONLY Osmocote Plus 6 month feed a couple years ago, and nothing else because of the simplicity of applying it and its effectiveness. The commercial growers of container roses seem to unanimously use Osmocote, or another less expensive commercial version of it that employs the same principle.

I used to apply well composted pigeon manure from my loft in late autumn for years, but got away from that recently. Seems that the Osmocote covers all bases pretty well without it.

I do mulch heavily with small sized pine bark, topping off every early spring to maintain a consistent 2-2.5" depth. This keeps the soil cooler, less spikes in heat, weed subdued, less watering, and it looks nice. The pine bark mulch decomposes very slowly, also it keeps soil compaction minimized since I have to walk into my bed which is about 4 HTs (slender bushes) deep, to work the roses.

Thanks for sharing your much valued responses.

Moses.