When should I fertilize my blue & honey berry bushes

My buds are expanding Mostly flowers on my Blueberry bushes and growth buds on the Honeyberry bushes. At what time do I apply feed. Blue berries will get Ammonium Sulfate while the Honeyberry bushes will get 20-0-10. My soil is full of 0-infinity-0

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Now.

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normally id hit them with a compost tea just as the fruit forms, but it may be too late for that. try watering with some Miricle grow, besides the other fertilizer, to give them a quick boost for fruit production. back off a little with the 20-0-10 if you do. i try to fertilize in fall once the bushes are dormant so when they wake up they have what they need. esp. early fruiting trees/ bushes.

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