hardhack

詳細解釋：

hard.hack

n.（名詞）
A woody plant(Spiraea tomentosa) of eastern North America, having leaves with rusty down on the undersides and spikelike clusters of small, rose-purple flowers. Also called steeplebush
絨毛繡線菊：一種產於北美東部生有下側為鐵鏽色的葉子和成串的呈玫瑰紫色的穗形小花的木本植物（絨毛繡線菊 繡線菊屬） 也作 steeplebush