The rainy season will soon start in Tokyo, and that means the hydrangea season will too. And this is one of its cultivars, i.e., hydrangea macrophylla f. normalis or lacecap hydrangea, one of my favorites!
You may think you are looking at hydrangeas on shrubs producing different colored flowers, i.e., pink, blue and green (scroll down!), but you're not. These are all on the same shrub, changing color from green to blue then to pink.
The color of hydrangeas depends on the pH level of the soil with higher acidity levels resulting in blue flowers and alkaline soil producing pink flowers, but I don't understand why hydrangeas change color like this. The pH level for the blooms (and the shrub) should be the same when the flower is green, blue or pink... But it's okay! I've decided to focus on enjoying their incredibly beautiful colors!
What look like petals are actually sepals and the tiny round things surrounded by the sepals are florets (i.e., flowers).
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| Hydrangea macrophylla f. normalis after color change ピンクに変わった額紫陽花 |
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| Lacecap hydrangea after color change ピンクのガクアジサイ |
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| 5/15 |
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| Before color change ピンクになる前 |
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| A shrub has pink and green flowers 緑とピンクの花が混在 |
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| A crane fly on a hydrangea leaf ガガンボ |
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紫陽花の季節です。そして今年最初の紫陽花、ガクアジサイです！大好きです。
皆さん、ピンクと緑と青の別々のガクアジサイだとお思いですか？ブッブー！この紫陽花、緑から青、そしてピンクに色が変わるんです。紫陽花の色が土壌の酸性度によることは知られています。酸性なら青、アルカリ性なら赤です。でも、花の色が変わるのはなぜなんでしょうか（だって土壌の酸性度は同じでしょ？）。でもそういう疑問を吹き飛ばすほどきれい！！
ちなみに花のように見えるのは咢、咢に囲まれた粒粒の部分が花序（つまり花）です。
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