- Written by Robbi Hoy
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Helpful Tip from the Garden Geeks: Did you know that veggie juice reveals pH? You can make your own soil pH indicator at home. Shred some red cabbage leaves. Cook them in hot water until the water turns light red. Strain out the cabbage. Collect a soil sample from your garden and put it in a white bowl. Carefully add some red cabbage juice. If the red color of the water deepens, your soil is acidic. If it remains the same, your soil is neutral. But if it takes on a blue or purple tint, the soil is alkaline.