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I can't seem to keep my ph in soil at 6.5. I bought some earth juice ph down crystals and added them to the soil directly ,is that ok?

Thanks for the timely suggestion. My soil is organicaire, supposedly neutral but pH keeps climbing above 7 and plants stressssed

but then again i cant find hard evidence on this subject. Anyone KNOW about stems going purple?

my white widows are turning purple in the stems and i suspect temps low and pH too high