應該是師姐爬文岩, 酸藍鹼紅
原文: https://www.hgtv.com/outdoors/fl ... nge-hydrangea-color Generally speaking, acidic soil, with a pH lower than 6.0, yields blue or lavender-blue hydrangea blooms. Alkaline soil, with a pH above 7.0, promotes pinks and reds. With a pH between 6 and 7, the blooms turn purple or bluish-pink.
不過有關花青素的說明, 及pH試紙的顏色, 就真的不明白了
現在花已經開定了不能試, 下次吧
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