キリンソウと四季の彩り日記屋上緑化システム株式会社
技術顧問　山下 律正

124

耐候性　セダム以上の性能があるのか？

Weather resistance: Does it have better performance than sedum?

3：四季彩キリンソウの蒸れ・葉やけ耐性　

3: Resistant to stuffiness and leaf burn

四季彩8は蒸れ・葉やけは稀に生じる程度で他の品種に比べ発生は少ないが

地表よりの高さが低い場合、落葉時期に重なった場合は障害が発生しているように見える

Shikisai 8 only rarely experiences stuffiness or leaf burn, and it is less common than other varieties. If the height from the ground is low, or if it coincides with the leaf falling season, it appears that a problem has occurred.

枯損原因

１　茎が倒れ葉の裏側に直射日光が当たる場合

２　地表に近くなり環境変化を受けた場合

３　7月～8月は下葉の落葉時期と重なり、落葉と見間違える場合

タケシマキリンソウ、キリンソウ、セダムに発生する耐候性障害には四季彩8は強い性質がある

Cause of withering

1. If the stem falls and the back side of the leaves is exposed to direct sunlight 2 In the case of environmental changes near the ground surface 3. July to August overlaps with the falling leaves of the lower leaves, and may be mistaken for falling leaves. Shikisai 8 has strong properties against weather resistance problems that occur in Phedimus takesimensis, Phedimus , and Sedum.

写真１：　茎が倒れ葉の裏側に  直射日光が当たり障害発生

Stems fall and direct sunlight hits  the underside of leaves, causing damage

写真２　地表に近くなり環境変化を受けた場合

If you are close to the ground and are subject to environmental changes

<参考資料：8>　<Reference materials: 8>

岡山県：２０２３年７月～８月酷暑期の気温・日照・降水量　

Okayama Prefecture: Temperature, sunshine, and precipitation during the extremely hot period from July to August 2023

キリンソウは耐候性が強い植物なので、ひでりのみでは下葉が落ちる程度で枯損等の障害は発生しない植物と言われてきたが、昨今の高温・日照現象が続く日々の中で

降雨と高温・日照がセットで訪れると、急激に土壌中の水分が高温になり、付近の抵抗性の下がった植物部位に障害が出る＝蒸れ現象と呼ばれている。

ほふく性や開張型キリンソウに発生しやすい酷暑期の障害は大抵の場合、部分的に枯損するのみで、株が消滅する事はなく、復活するのでキリンソウでは大きな欠点にはみなされなかったが２０２３年の夏は株枯れ現象が認められた。

Kirinsou(Phedimus) is a plant with high weather resistance, so it was said that drought alone would cause only the lower leaves to fall and not cause damage such as withering. In these days of high temperatures and sunshine, When rainfall, high temperatures, and sunshine come together, the water content in the soil suddenly rises to high temperatures, causing damage to nearby plant parts that have reduced resistance. ＝It is called withering phenomenon by high temperature steam, The wilting phenomenon caused by high-temperature steam is a disorder during the extremely hot season that tends to occur in crouching and spreading-type kirinsou(Phedimus) .

In most cases, it was only partially withered, the stock did not disappear, and it revived, so it was not regarded as a major drawback for Kirinsou（Phedimus）, but a phenomenon was observed in the summer of 2023.

東京都市大学　総合研究所　客員研究員　山下律正

問合せ先：yukistr@oboe.ocn.ne.jp

contact address

Ritsumasa Yamashita

Visiting Researcher, General Research Institute,

Tokyo City University

Contact: Please contact yukistr@oboe.ocn.ne.jp