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Questions About Wafer Ash Trees

  • Answered by
    GKH_Susan on
    November 17, 2021
    Certified Expert

    I think your odds are very good. Trees are best planted in the fall. If you have a dry winter, be sure to irrigate it about once a month. You can increase your number of Giant swallowtails by planting the herb rue (Ruta graveolens), which is also a host plant. It is hardy to zone 4 so should do fine during the winter. Mine seem to die out after a couple of years but I know others who have it for a long time. I also grow common prickly ash, Zanthoxylum americanum, and I always get caterpillars of the Giant.

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