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As a comment about Evening Primrose (Oenothera macrocarpa), Lioba wrote:

The evening primrose is invasive. You might want to plant into a container in the ground to contain its spread. The root system is relatively shallow. I live in UpState NY northern Catskill Region, zone 5a, for those of you who live in climates like this. My neighbors use creative containers like large tractor tires or farm equipment parts. Although these are above ground, the plant does fine.
Name: Deb
Pacific NW (Zone 8b)
Region: Pacific Northwest Organic Gardener Deer Ferns Herbs Dragonflies
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Nov 9, 2017 4:42 PM CST
It would be more accurate to indicate where you have found this plant to be invasive. I live in the Pacific NW and do not have any problem with it either reseeding itself or spreading aggressively. It just slowly increases the same as any other perennial. I don't doubt that it is invasive in other regions, just suggesting that knowing where it is problematic would be helpful.
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Name: Anita
West Fulton, NY (Zone 5a)
"Let food be thy medicine...."
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Dec 28, 2017 7:42 AM CST
Hi Deb,

I live In UpState NY Northern Catskill Region Zone 5a. My Mom gave me 4 plants 2 summers ago. I planted them under heirloom yellow roses and now they are so dense, tall and growing into the grass. My neighbors keep them in huge containers made from farming equipment. I am moving some to under the lilac bushes for weed suppression.

I had no idea this would happen so I thought it important to add that.

Its easy for me to believe in miracles when science can't explain why a blade of grass has its shape and that is just one plant and one attribute.

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