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

208

下葉の自然落下　生存適応で得た生理現象か？

Natural fall of lower leaves 　Is it a physiological phenomenon acquired through survival adaptation?

四季彩6　６０日無潅水　ひでり試験

結果：小葉の花序枝葉に障害が発生したが、葉芽の枯損は無く大型葉は緑化景観を継続した

１　ひでり等の過酷な環境では伸長した太い茎は主株の生活圏外への伸長に伴い下葉を落葉させる。

２　四季彩6も落葉が見られるが、枝間隔が広い四季彩６では株内の通気が良く低く押さえられる。

３　葉枝（花序のない枝）は下葉の落葉が少なく直立型に成長する傾向が高い。

４　大型に成長した枝は、主株の生活圏外に伸長しヒトデ状の緑化景観となる。

５　葉枝では強力な日射と高気温に晒されるひでり環境でも枯損は少ない。

６　花枝で花枝は果実に栄養を取られる事と花枝の葉は比較的小型の場合が多く極度の環境が続くと枯損しやすい。

Shikisai 6

60 days without watering test Result:

Result: Although damage occurred to the inflorescence branches and leaves of the small leaves, the leaf buds did not wither and the large leaves continued to maintain a green landscape.

1. In harsh environments, such as in Hideri, the elongated thick stems shed lower leaves as they extend outside the main plant’s living range.

2. Fallen leaves can also be seen in Shikisai 6, but Shikisai 6 has wide spacing between branches, allowing good ventilation inside the plant and keeping it low.

3. Leaf branches (branches without inflorescences) tend to grow upright with less deciduous lower leaves.

4. Large-grown branches extend beyond the living area of the main plant, creating a starfish-shaped green landscape.

5. Leaves and branches are less likely to wither even in a sunny environment where they are exposed to strong sunlight and high temperatures.

6. Flowering branches: Flowering branches are nourished by fruit, and the leaves of flowering branches are often relatively small, making them easy to wither if the environment continues to be extreme.

比較写真：

８月２６日

落葉性キリンソウ（タケシマキリンソウ種）

茎長が最長50cmに達し、先端部の重みで茎は倒れ開張型となる。

葉は常緑性種と同じく株元より新旧交代して生え揃う。

August 26^th

Comparison photo: Deciduous Phedimus takesimensis

The stem length reaches a maximum of 50 cm, and the weight of the tip causes the stem to fall over and become an open type. Like evergreen species, the leaves grow in alternating order from the base of the plant.

技術顧問　山下律正

Technical Advisor: Ritsumeikan Yamashita