Tip - Acidify soil - Irrigate with lemon juice?

Has anyone done this for an acid loving plant? Next time I irrigate, I'd like to try with my miracle fruit plant. It seems like I haven't gotten the soil pH down far enough (target: 4.5). The potting mix I used is only a 6.5 or something. I've added some micro pine bark chips and pine bark fines for...
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