Southern prickly ash, a tree with warts and prickles, is used to soothe toothaches, other ailments and said to be packed with essential oils. It is native to southeastern U.S.

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But the toothache tree is also a host plant for the Giant Swallowtail butterfly, the largest butterfly in all of North America.

Since picking prickly ash is laborious and takes a lot of time, the cost of labor has been on the rise in recent years, he said. Last year, the net income of Ma's family reached 30,000 yuan.

Photograph by Robin Smith, Photolibrary/Getty Images Hollies Get Prickly for a Reason Festive trees make spiny leaves to ward off nibblers.

Posted on October 2nd, 2017 in | Comments Off on What options do we have to treat our ash trees against the Emerald Ash Borer? Imidacloprid, the active ingredient works by killing adults when they ...