5 thoughts on “FOTD 26th June 2019: Hydrangea

      • Blue requires acidity, which is not too difficult under all the redwoods. Although the soil here is naturally slightly alkaline, the foliar litter is slightly acidic. I acidify the soil slightly for the blue hydrangeas, and make the soil slightly more alkaline (or just inhibit the acidification of it) for the pink hydrangeas. In the Santa Clara Valley, it was not so easy to get blue hydrangeas. White hydrangeas are always white.

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