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Need green thumb advice!
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<blockquote data-quote="Marguerite" data-source="post: 184246" data-attributes="member: 1991"><p>Scientifically - metals react to form base (alkali) and non-metals react to form acid.</p><p></p><p>So alum works well for blueing hydrangeas. In fact, we can buy hydrangea bluing agent which is almost pure alum.</p><p></p><p>To make them pink - use lime - calcium hydroxide. Or anything to make the soil more alkaline. Crushed eggshells work the same as lime and are a good way to recycle into the earth in a good way. Hydrangeas love fertiliser. Just don't put neat manure too close to the roots.</p><p></p><p>My mother was a cheapskate who recycled before it was fashionable. That's why she used her steel wool pads. They also provided iron to the leaves to keep them green - large leaves use a lot of chlorophyll and this needs iron. I always thought it was the steel wool that made the hydrangeas pink but I could be wrong. </p><p></p><p>Marg</p></blockquote><p></p>
[QUOTE="Marguerite, post: 184246, member: 1991"] Scientifically - metals react to form base (alkali) and non-metals react to form acid. So alum works well for blueing hydrangeas. In fact, we can buy hydrangea bluing agent which is almost pure alum. To make them pink - use lime - calcium hydroxide. Or anything to make the soil more alkaline. Crushed eggshells work the same as lime and are a good way to recycle into the earth in a good way. Hydrangeas love fertiliser. Just don't put neat manure too close to the roots. My mother was a cheapskate who recycled before it was fashionable. That's why she used her steel wool pads. They also provided iron to the leaves to keep them green - large leaves use a lot of chlorophyll and this needs iron. I always thought it was the steel wool that made the hydrangeas pink but I could be wrong. Marg [/QUOTE]
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