All Things Gardening forum: St. John's Wort

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springfield MO area (Zone 6a)
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Frillylily
Aug 30, 2017 8:51 AM CST
I am looking for a shrub that gets about 3 ft tall and has yellow flowers. I currently have yellow knock out roses in front of my living room window and I am unhappy w them. I love the scent-very strong, but they are not doing well for me. I am wondering if St. John's Wort may be an option for me. I have full sun there and it is well draining soil. Does this bloom all summer or just have a bloom time and is done? Are the blooms scented? Does the foliage have a scent? Does it have invasive roots? Does it come up by seed all over the place? I am having a hard time finding out much about this plant, just lots of info on it regarding its use as ah herb. Also any other suggestions for yellow flowered shrubs please.

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Lauram847
Sep 2, 2017 4:35 PM CST
I love St. John's Wort (Hypericum)! To answer your questions:

My shrubs tend to bloom throughout July. Once the flowers are spent the plant has very pretty seed pods.

I have never noticed a scent to any part of the plant but the bees just love the flowers! It does NOT have an invasive root system but can send out seedlings. However, the seedlings have not overwhelmed my garden. I have been able to transplant some of the volunteers to other locations in my yard as well as share a few with friends. They are easy to remove if you don't want them.

Unfortunately, I haven't taken a good photo of my shrubs in bloom (note to myself for next year!) but I have included 2 of the best pictures I have - one in early bloom (it's the shrub with a couple yellow flowers in the center of the photo) and one after bloom with the seed pods.

As far as other yellow flowering shrubs, I would suggest the sometimes overdone Forsythia or the lessor known Kerria. Each only bloom in Spring and then you are left with greenery for the rest of the Summer. The Kerria however has green stems which give you some color throughout the winter months.
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Name: Gary
Wyoming MN (Zone 4a)
hostasmore
Sep 2, 2017 4:42 PM CST
How about yellow flowered potentilla?
Name: Sandy B.
Ford River, Michigan UP (Zone 4b)
(Zone 4b-maybe 5a)
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Weedwhacker
Sep 2, 2017 6:33 PM CST
I was also thinking potentilla! Smiling

Thanks for the report on the St. John's Wort, Laura -- I have a few plants that I started from seed this year, waiting to be planted for my new "pollinator garden." Along with a whole bunch of other plants... should have had them all in the ground by now, but they WILL be in this month! (many of them were started last year and overwintered in my veg garden, then dug back up and put into pots -- not doing that again Glare )
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North Central TX (Zone 8a)
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tx_flower_child
Sep 2, 2017 10:49 PM CST
@Lauram847 — that is one big St. John's Wort! Whereabouts do you live?

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Lauram847
Sep 3, 2017 9:44 AM CST
I live in the suburbs of Chicago. Actallly the shrub in the picture is one of the seedlings that I transplanted from the original shrub. I guess it really likes this part of the garden.

Potentilla is a good thought Smiling . I forgot about it since it is not one of my favorite plants. I had a yellow variety and another called Mango Tango but they both just declined over a few years.
Name: Deb
Pacific NW (Zone 8b)
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Bonehead
Sep 3, 2017 1:02 PM CST
The common St. John's wort may prove to be more invasive than you might like, perhaps check with a local nursery on that issue. I do know that the University of Washington campus has used the common form as an understory to many of its mature trees, likely because it does tend to fill in an area well. The cultivars are typically less robust about spreading out. I have 'Harvest Festival Chocolate' which has been very polite so far, but is also a shorter shrub, perhaps 2' at maturity. It's a compact form.
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