Answer: You can use 30-10-10 on your raspberries but next time you purchase fertilizer, I'd recommend a 10-10-10. The plant food for azaleas and camellias is acidified which is something your raspberries will appreciate, but it's fairly high in nitrogen which will promote lush, green growth, but at the expense of flowers. A 10-10-10 will be lower in nitrogen so your raspberries will put more of their energy into both growing and flowering, hence you'll have more fruit.
Best wishes with your raspberries!
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