Thelesperma filifolium
5月
26日
However, I think they are an invasive species [がいらいせいぶつ] called Thelesperma filifolium, from America. Once I saw on Japanese TV a group of volunteers pulling them out & putting them in garbage [ごみ] bags. I`m pretty sure it was this kind of flower.
That`s good - I won`t feel bad when I pull some out one day (to put in a vase, not a garbage bag though!)