看看这段英文,是我在网站上看到的;Add lime to your garden soil to produce pink blooms and add aluminum sulfate to your soil to produce blue blooms. It will be necessary to amend the soil in this fashion at least twice over the summer months, and it may take up to two years to see bloom colors change.
如果你想使你的绣球花变成你想要的理想颜色,就要在土壤里添加硫酸铝aluminum sulfate才能变成蓝色,加石灰粉lime powder变成粉色,至少要在夏季里添加2次,这样可能经过2年的时间颜色才会发生变化。
aluminum sulfate & lime powder 可以在garden centre买到。
谢谢!