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Total beginner gardener here. Haven't lurked /out/ for more than a few hours so I have just this one question until I check the information in the resources section.
Are there any homemade options to reduce or increase the pH of my soil? So far I've found that using lemon/vinegar might help to reduce it and eggshells for the opposite but I'm pretty doubtful about this and afraid to do any potential harm to my plants.
Any suggestions? Pic related is what I'm attempting to grow. Planning on introducing some lettuce in the upcoming days.