多年生杂草是寿命超过两年以上的草类，一生中能多次开花结实。在开花结实后地上部死亡，依靠地下器官越冬，次年春季从地下营养器官又长出新株。
本药剂能有效地防治近百种一年生及多年生杂草。
The agent can effectively prevent hundreds of species of annual and perennial weeds.
美洲多年生粗杂草，茎穿过巨大的叶子，花紫色或暗红色。
Coarse weedy American perennial herb with large usually perfoliate leaves and purple or dull red flowers.
选用24%氨氯吡啶酸水剂，对林地一年生及多年生阔叶杂草、灌木进行防除试验。
The controlling test was carried out to the annual and perennial broadleaved weed and shrub on forestland with 24% picloram Sc.
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