St. John’s Wort Plants

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  1. What Is Eating My St. John’s Wort?
  2. St. John’s Wort
  3. Getting Hidcote St John's Wort to Flower
  4. can st johns wort planted in a container survive over winter in zone 5?
  5. St. John's wort, starburst
  6. St John's Wort
  7. Transplanting
Asked by Anonymous on May 28, 2011
What Is Eating My St. John’s Wort?

Something has infested my St. John’s Wort plants, and I think it is scale but would like your input. The leaves are heavily invested (from the ground up) with a pin head size ‘dot’ that is orange/yellow in color and cannot be wiped off. . . on the underside of the leaf. The top of the leaves have brown dots where this thing has eaten from the under side. My plants were so healthy and it seems this has happened rapidly. What do you think it could be, and how should I treat it?

ANSWERS
Nikki
Certified GKH Gardening Expert

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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Asked by avonladymj on May 31, 2011
St. John’s Wort

Is St. John’s wort plant okay with saltwater area?

ANSWERS
Heather
Certified GKH Gardening Expert

Yes, it is salt tolerant.

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Asked by Anonymous on July 21, 2015
Getting Hidcote St John’s Wort to Flower

I have several Hidcote St. John’s Wort bushes for about 5 years now. This year they are growing nicely, very big and bushy, but hardly any flowers. I have them cut back each year in early spring. Is there anything I can do to have them flower more? Thanks.

ANSWERS
villiers

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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Asked by Anonymous on April 7, 2017
Can St Johns Wort Planted in a Container Survive Over Winter in Zone 5?

same as above

ANSWERS
Downtoearthdigs
Certified GKH Gardening Expert

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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Asked by Cachetok@roadrunner.com on July 4, 2017
St. John’s Wort, Starburst

Is one required to dead head St. John\’s wort?

ANSWERS
Downtoearthdigs
Certified GKH Gardening Expert

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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Asked by Mimmck@live.com on July 4, 2017
St John’s Wort

Have had St John\’s Wort for at least 20 years, but after the first couple of years it\’s blooms diminished. We have added Peat to the soil, with limited results. The foliage appears healthy. It is in a mostly sunny spot, and I don\’t believe I can move it, although I have transplanted small offshoots.

ANSWERS
Downtoearthdigs
Certified GKH Gardening Expert

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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Asked by loubradley774 on July 31, 2017
Transplanting

When can I transplant St. Johns Wort? What time of year?

ANSWERS
nikki-phipps
Certified GKH Gardening Expert

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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