丸葉縷紅(マルバルコウ) red morning-glory

　朝顔に似た小さなラッパ型の花が、土手やフェンスに絡みついたりしているのを見かけます。蔓性の外来植物で、繁殖力も強く、あたり一面を覆ってしまうので在来種と競合します。
　似た花にルコウソウがあります。花だけ見ると区別は難しいですが、マルバルコウの葉は丸く、一方ルコウソウの葉は細いので区別が付きます。どちらも侵略的帰化植物と見なされ雑草扱いです。

　話は変わりますが、お酢が有機的な除草剤として使えます。食用のお酢を薄めず、そのまま晴れた日にスプレーすると、植物は乾燥して枯れます。ただし、除草剤ほどの効果はありません。
　雑草にはお酢を、ナメクジにはお塩ですね。植物にお塩は、土を悪くするので厳禁です。

　Embankments and fences often have small trumpet-shaped flowers that resemble morning glories. This vine plant is invasive and has a high reproductive rate, covering the entire area and competing with native species.
　Cypress vine is a flower that is similar in appearance to red morning-glory. Although it is difficult to distinguish them by their flower shapes alone, the leaves of the red morning-glory are round, while the leaves of the cypress vine are string-shaped, making it possible to tell them apart. Both plants are referred to as invasive naturalized plants and are treated as weeds.

　By the way, vinegar can be used as an organic weed killer. Spraying undiluted edible vinegar on a sunny day will cause the plant to dry out and die. It is not as effective as herbicides.
　Vinegar for weeds and salt for slugs! Salt is strictly forbidden on plants because it makes the soil worse.