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Top Questions About St. John's Wort Plants

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Questions About St. John's Wort Plants

  • Answered by
    Nikki on
    May 28, 2011
    Certified Expert
    A.

    It might be scale, but it might also be aphids. Regardless, they are treated the same. We have had great success with using neem oil on these types of pests. This article will explain more: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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  • Answered by
    Heather on
    June 4, 2011
    Certified Expert
    A.

    Yes, it is salt tolerant.

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  • Answered by
    villiers on
    July 21, 2015
    A.

    By pruning your shrub in Spring you are simply cutting off that years flower buds.Prune after flowering in (say) October, but don't leave it too late. Then the buds will develop for next year.

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  • Answered by
    Downtoearthdigs on
    April 8, 2017
    A.

    St John's Wart is hardy to zone 4. Grown in a pot, the plant would be more vulnerable to the cold winter temperatures.
    The pot can be placed in a sheltered, but cold location, such as a shed or garage.

    https://www.gardeningknowhow.com/edible/herbs/st-johns-wort/st-johns-wort-plant-care.htm

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  • Answered by
    Downtoearthdigs on
    July 5, 2017
    A.

    It is not necessary to dead head the plant.
    Pruning can take place in early spring, just before new growth starts.
    https://www.gardeningknowhow.com/edible/herbs/st-johns-wort/pruning-st-johns-wort.htm

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  • Answered by
    Downtoearthdigs on
    July 5, 2017
    A.

    You may have excess nitrogen in the soil, which will inhibit flowering.
    You an feed phosphorous, with Bone Meal.

    https://www.gardeningknowhow.com/edible/herbs/st-johns-wort/st-johns-wort-plant-care.htm

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  • Answered by
    nikki-phipps on
    August 1, 2017
    Certified Expert
    A.

    Established plants are best moved either in spring after all threat of frost has passed or during fall, prior to frost.

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