Perennials forum: How does St. Johns wort spread?

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Name: Deb
Pacific Northwest (Zone 8b)
Region: Pacific Northwest Organic Gardener Herbs Dragonflies Dog Lover Keeper of Poultry
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Bonehead
May 12, 2015 7:09 PM CST
I just bought a hopefully less aggressive hypericum (Festival Chocolate) that promises to stay compact. I only bought one gallon size, knowing that this plant will likely increase itself, but I forget how it does so - by underground? At this point, I'd like to encourage a bit of spreading, then hold it to a defined area in my herb garden.
I want to live in a world where the chicken can cross the road without its motives being questioned.
Name: Jason
Gold Bar, Washington (Zone 8b)
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riverman123
May 13, 2015 4:53 AM CST
no way would I plant that thing in my garden!! read up.

http://www.nwcb.wa.gov/detail.asp?weed=75
Name: Deb
Pacific Northwest (Zone 8b)
Region: Pacific Northwest Organic Gardener Herbs Dragonflies Dog Lover Keeper of Poultry
Birds Lover of wildlife (Raccoon badge) Garden Ideas: Master Level Celebrating Gardening: 2015 Garden Sages Plant Identifier
Image
Bonehead
May 13, 2015 12:02 PM CST
Jason, your article relates to H. perforatum which is also known as common St. John's wort. I have previously grown St. John's wort in my garden here in the PNW, did not find it overly aggressive, and have successfully removed it during a yard renovation when it no longer fit in. I didn't have any problem with it reseeding, and it actually spread out slower than I had anticipated. Perhaps that one was a hybrid of some sort - that was back before I was actively tracking the latin names of my plants.

In any event, the variety I purchased is a more compact hybrid which is not as aggressive as the common form. Perhaps it is sterile (like many butterfly bushes offered in Washington), although I haven't found a lot of information online about my particular plant. I am planting it in the medicinal section of my herb garden and plan to keep it confined to about a 4x2 foot area. Since I know it will spread by itself I only bought one plant which looks a bit silly at the moment, so I'm trying to get a couple more starts from my existing plant to fill in the target area quicker.


I want to live in a world where the chicken can cross the road without its motives being questioned.

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