Bull Thistle Control: Managing Bull Thistle Plants In Gardens

by johnah on November 25, 2020

Bull Thistle (Silybum marianum) is a common weed in many gardens, especially those with young plants. It grows very fast and spreads quickly, so it’s best not to have it growing near your house or garden. However, if you want to keep it out of your yard, there are several methods that you can use. You may even need to hire someone to do some work around the house because they will likely get bitten by these plants as well!

The first thing you need to do is identify what kind of plant it is. There are two kinds of bull thistles, milk thistle and canada thistle. Milk Thistle is a type of perennial herb that grows up to 3 feet tall and produces white flowers in clusters from May through August.

Canola oil makes them edible, but they’re not really worth eating unless you make butter out of them! Canada Thistle is a perennial herb that grows up to 2 feet tall and produces yellow flowers in clusters from September through April. They produce seeds which are eaten raw or cooked.

Canola Oil Kills Bull Thistles?

There are several ways to kill bull thistles, including using insecticides, chemical fertilizers, heat treatments and even vinegar. None of these methods seem to work very well against bull thistles though.

Why not?

Well, for one thing the plants are too resilient to be killed off by such conventional means. Another reason is that these methods aren’t really good for the environment in general. Most of the time, it’s best to just leave bull thistles alone so that they can do their job of cleaning up the yard or garden. Having a lot of them is certainly better than having a dead area in your yard or garden where nothing will grow at all!

Cutting Down The Weeds

One of the best ways to remove bull thistles from your yard is to simply cut them down. This is also one of the least effective ways to kill them off, but it’s also one of the most fun! You can use a lawn mower, scythe or even a spade to go around and chop all of the weeds down.

This method is good because it gets rid of the bull thistle plants while also giving you exercise by having to walk around chopping them all down. However, bull thistles have a very extensive root system and sometimes they’ll grow back within a month. The convenience of this method is that you don’t need any special tools to do it!

Sources & references used in this article:

Biology of bull thistle, Cirsium vulgare (Savi) Tenore. by F Forcella, JM Randall – Reviews of Weed Science, 1994 – cabdirect.org

Bull Thistle, Cirsium vulgare by LW Mitich – Weed technology, 1998 – cambridge.org

Invasive Plants by B Thistle – US Forest Service https://www. na. fs. fed. us/fhp … – multisar.ca

Control and ecological studies of Scotch thistle by JA Young, RA Evans – Weed Science, 1969 – JSTOR

Microgrid Energy Ziegler Solar Garden Site by L Exhibit – 2017 – records.garfield-county.com

Seed colour variation, dormancy, and seed banks in the bull thistle, Cirsium vulgare (Savi) Ten by C Doucet – 1996 – ir.lib.uwo.ca

Cirsium vulgare (spear thistle) by A Lusweti, E Wabuyele, P Ssegawa… – … vulgare (spear thistle), 2011 – cabdirect.org

The Eleven Primary Noxious Weeds of Minnesota by GC COLORADO – 2010



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