Top Questions About Thistle Plants

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Questions About Thistle Plants

Asked by
Anonymous on
April 14, 2011

Q. Pet-Friendly Thistle Weed Killer

The family dog cuts its paws on thistle weeds in the large backyard, leading to complicated infections. There are too many to dig out. I need a safe thistle weed killer, without chemicals. I made a vinegar, salt, soap solution but this only kills the tops, not the roots. Can you help? Also, rabbits are becoming uncontrollable as well and their debrisĀ is causing theĀ dog to be sick.

Answered by
Nikki on
April 15, 2011
Certified Expert
A.

The only non-chemical way to get rid of thistle is to kill the leaves as soon as you see them. The roots will eventually die due to lack of sun.

This article will help with rabbits:
https://www.gardeningknowhow.com/plant-problems/pests/how-to-keep-rabbits-out-of-gardens.htm

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Asked by
harley on
May 19, 2011

Q. How Do I Kill Thistle (Picker Plants)?

How do I get rid of thistle weeds (picker plants)? They have over taken my flower bed. I tried digging them out last year. Thought I got the roots, but this year they are even worse than last year.

Answered by
Heather on
May 22, 2011
Certified Expert
A.

They are very hard to get rid of, but it can be done. This article will help:
https://www.gardeningknowhow.com/plant-problems/weeds/canada-thistle-control.htm

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Asked by
donnacookrn on
April 19, 2015

Q. How do you kill thistle?

I believe the thistle came from manure I used for fertilization in planting the red maple. It has now taken over the entire flower bed. There are also daylilies and hostas in the bed. This spring the thistle has spread into the surrounding grass as well. The thistle forms purple flowers at the top that die off like dandelions to spread. I’ve tried several popular store brands of weed killers that haven’t worked, any ideas?

Answered by
shelley on
April 20, 2015
Certified Expert
A.

You have either the bull or canada thistle. I can't quite tell from the photo, but I am leaning towards it being a canada thistle. You can identify for certain using the two following links:

Once you have determined which thistle it is, review the appropriate article below and recommended treatments:
https://www.gardeningknowhow.com/plant-problems/weeds/bull-thistle-control.htm
https://www.gardeningknowhow.com/plant-problems/weeds/canada-thistle-control.htm

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Asked by
dincraig on
July 20, 2015

Q. milk thistle plants in veggie garden

My neighbor has three milk thistle plants growing in her veggie garden. We live in a rural area where we raise cattle, sheep and horses. I have also been reading that it is quite an invasive plant. Is this true? As we raise sheep, should we be concerned about this?

Answered by
Downtoearthdigs on
July 20, 2015
Certified Expert
Asked by
Esper-of-tropica on
March 15, 2016

Q. What plant is this?

So today my family and I had finally went in the backyard to tucker out our dog when we stumbled across this plant. According to one of my family members, it did not sting to the touch, although it was quite prickly. So, does anyone know what sort of plant this is?

Answered by
Downtoearthdigs on
March 15, 2016
Certified Expert
A.

This is a thistle weed.

You will want to remove these from your garden.
Gloves will likely be necessary!

https://www.gardeningknowhow.com/plant-problems/weeds/canada-thistle-control.htm

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Asked by
Kalmiopsis48 on
June 29, 2016

Q. Using cornmeal to kill weeds

How thick does one need to spread the cornmeal? We have almost an acre heavily infested with burweed and bur clover with a few star thistle mixed in. I’d like to prevent the seed from growing next time around.

Martha
mmartha61@yahoo.com

Answered by
Downtoearthdigs on
June 29, 2016
Certified Expert
A.

20 pounds per 1000 square feet is the application rate used in the Iowa State University research test.
Please read the following links to give you more information and determine if the cornmeal is the best choice of weed control for you.

I would also encourage you to contact your local Country Extension Office to inquire on any information on control of these weeds specific to your region. They are a valuable source of information for these questions.

I have included a link to locate your nearest office.

https://www.gardeningknowhow.com/special/organic/cornmeal-in-the-garden.htm

http://extension.oregonstate.edu/gardening/corn-gluten-meal-did-not-prevent-weeds-germinating-osu-study

https://www.gardeningknowhow.com/plant-problems/weeds/control-of-lawn-spurweed.htm

https://www.gardeningknowhow.com/plant-problems/weeds/getting-rid-of-knapweed.htm?utm_source=ReviveOldPost
https://www.gardeningknowhow.com/extension-search

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Asked by
Anonymous on
March 12, 2017

Q. controling grass and weeds

How can I control the grass, thistles, and weeds that grow among my tiger lilies? Can I spray any type of weed, grass killer that won’t kill the lilies? Thank you

Answered by
Downtoearthdigs on
March 12, 2017
Certified Expert
A.

Pulling the weeds and using mulch to suppress the weeds in the future is the safest method.
If you remove them on a regular basis before they send out seeds you can start to eliminate them.
Any weed killer, whether natural or chemical, will kill weeds but also will kill your flowers if it comes in contact. The contact can be from direct spray or from overspray.

Here are some links with more information.

https://www.gardeningknowhow.com/plant-problems/weeds/how-to-keep-weeds-from-the-flower-bed-out-of-your-lawn.htm
https://www.gardeningknowhow.com/special/organic/weed-it-and-reap-how-to-make-your-garden-more-appealing-without-chemicals.htm
https://www.gardeningknowhow.com/plant-problems/weeds/pre-emergent-herbicides.htm
https://www.gardeningknowhow.com/plant-problems/weeds/using-herbicide-in-gardens.htm
https://www.gardeningknowhow.com/plant-problems/weeds/using-organic-herbicides.htm
https://www.gardeningknowhow.com/plant-problems/environmental/herbicide-plant-damage.htm

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