Top Questions About St. John’s Wort Plants

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Questions About St. John’s Wort Plants

Asked by
Anonymous on
May 28, 2011

Q. 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?

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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Asked by
avonladymj on
May 31, 2011

Q. St. John’s Wort

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

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

Yes, it is salt tolerant.

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Asked by
Anonymous on
July 21, 2015

Q. 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.

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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Asked by
Anonymous on
April 7, 2017

Q. can st johns wort planted in a container survive over winter in zone 5?

same as above

Answered by
Downtoearthdigs on
April 8, 2017
Certified Expert
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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Asked by
Cachetok on
July 4, 2017
Lewiston NY 14092

Q. St. John’s wort, starburst

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

Answered by
Downtoearthdigs on
July 5, 2017
Certified Expert
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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Asked by
Mimmck on
July 4, 2017
Symmes Township Ohio 45140. Zone 5?

Q. 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.

Answered by
Downtoearthdigs on
July 5, 2017
Certified Expert
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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Asked by
loubradley774 on
July 31, 2017
95713

Q. Transplanting

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

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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