Culham Research Group
Just another blogs.reading.ac.uk site
Skip to content
  • Home
  • About
  • Advent Botany
    • Advent Botany 2014
    • Advent Botany 2015
    • Advent Botany 2016
    • Advent Botany 2017
    • Advent Botany 2019
    • Taxonomic index to #AdventBotany
  • PhD Students
    • Ahmed Gawhari – PhD 2016
    • Ana Simoes
    • Anas Tawfeeq
    • Azi Jamaludin
    • Donald Zulu
    • Jordan Bilsborrow
    • Maria Christodoulou – PhD 2016
    • Tomos Jones
    • Widad Aljuhani – PhD 2015
    • Kálmán Könyves – PhD 2014
    • Marshall Heap – PhD 2014
    • Ahmed El-Banhawy
    • Hassan Rankou
    • Oli Ellingham
    • Aramide Dolapo Oshingboye – L’Oreal Visiting Fellowship 2014/2015
  • Projects
← PhD update: An apple by any other name…
UK Powdery Mildew Baseline Review →

Some thoughts on Equisetum arvense

Posted on February 11, 2015 by Alastair Culham
Equisetum arvense, the common horsetail

Equisetum arvense, the common horsetail

The horsetails, botanically the genus Equisetum, are perhaps some of the most distinctive plants in the world with their ridged hollow stems, that lack green leaves, and their cones bearing jumping spores.  However they are also a problem to gardeners who do not want them competing with their flowers or vegetables.  Unlike Japanese knotweed (Fallopia japonica), a non-native for which there are now many control measures, the common horsetail is a native plant with no biological control.

As a botanist I appreciate this ancient lineage of plants, that is now classified with the ferns, and even grow some of the less invasive species including Equisetum hyemale of the form often sold as E. japonicum.  In the University Tropical Glasshouse we have Equisetum myriochaetum, a horsetail that can grow several metres high but is not frost tolerant.  At one time horsetails were even thought to accumulate gold!

Horsetail in full and vigorous growth.

Horsetail in full and vigorous growth.

However, the stimulus for this blog was a phone-call yesterday afternoon asking for advice on how to eradicate horsetail from a rock garden.  My initial response, thinking this was a small domestic rock garden, was to suggest moving the rocks to a new clear site and to replant from scratch because the movement of any soil would risk transfer of horsetail too.  However it soon turned out the problem was on a rather grander scale, the problem was in the rock garden at a major historic house.  At that point I had to think hard.  I’ve been trying on-and-off to eradicate horsetail from my allotment for five years but still it comes back every spring.  The plant sends rhizomes several metres into the soil, those rhizomes are brown or black in colour and fragment easily.  Horsetail can regenerate from small rhizome fragments so digging it out is just not practical.  With severe infestations an initial dig to remove the bulk of the rhizomes is worthwhile, but only to help with the next stage.

Bruising of the stems followed by treatment with a glyphosate containing systemic weedkiller is one of two ways I have found to reduce the vigour of horsetail and is also recommended by the RHS.  Even then it can take several treatments and several years of dedicated search-and-treat to remove all traces of horsetail.  Any small surviving fragments will regenerate rapidly and soon re-establish the plant.  The second method is to clear the ground entirely and cover it with thick black plastic for at least five years, and sometimes longer to starve the plant of light and water, even then, there may be small persistent fragments that will re-grow.

On an established rockery, eradication would take a dedicated team with good eyesight and plenty of both time and systemic weedkiller to keep the plant under control, and probably nothing short of a miracle to totally eradicate the horsetail.  Gardeners only stay as gardeners if they have persistence and optimism in the face of adversity so don’t let that put you off.

So my advice; if the infestation is heavy, dig and hand weed the bulk of the material then check on a weekly basis for new shoots, bruise them by hitting with a trowel or rake (or any hard object) and paint them with glyphosate weedkiller.  Keep doing that for 5-10 years and with any luck the horsetail will go.  But even then you need to stay vigilant for the first signs of return.

A weedkiller I have not tried, and that is sold for horsetail eradication, is Glufosinate-ammonium (included in products such as ‘Kurtail‘ and ‘Whippet Horse Tail Killer’) however the environmental safety of this chemical is debated by several organisations including the Pesticide Action Network but I have no personal experience of its use and leave the reader to make their own decision.  Legislation controlling which herbicides can be used in Europe is gradually being amended.

Share this:

  • Facebook
  • Twitter
  • LinkedIn
  • Email
  • Tumblr
  • Pinterest
  • Pocket
  • Print
  • More
  • Reddit
  • Google

Like this:

Like Loading...

About Alastair Culham

A professional botanist and biologist with an interest in promoting biological knowledge and awareness to all.
View all posts by Alastair Culham →
This entry was posted in Herbarium RNG, Public Engagement with Science and tagged Equisetum control, Horsetail. Bookmark the permalink.
← PhD update: An apple by any other name…
UK Powdery Mildew Baseline Review →
Logging In...

Leave a Reply Cancel reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  • Recent Posts

    • A personal reflection on Wild about Weeds – author Jack Wallington
    • Community fungal DNA workshop
    • #AdventBotany 2019 Day 6: Deck the Halls with Boughs of Holly…
    • Final call: help identify potentially invasive plants
    • #AdventBotany 2019 Day 2: Death by chocolate
  • Recent Comments

    • Specimens, Specimens: Uses | Herbarium World on Brief notes on some Percival Wheats
    • Tendrils: 151218 – The Unconventional Gardener on Advent Botany 2015 – Day 15: Mahleb
    • Tendrils: 151218 – The Unconventional Gardener on Advent Botany 2015 – Day 17: Sgan t’sek
    • Tomos Jones on A personal reflection on Wild about Weeds – author Jack Wallington
    • Future Invaders in your Garden? – The Gardening Zoologist on Future invaders at RHS Chelsea
  • Categories

    • Advent
    • Art
    • Catalogue of Life
    • Collectors
    • e-learning
    • Hawkins Research Group
    • Herbarium RNG
    • i4Life
    • MSc Plant Diversity
    • PhD research
    • Public Engagement with Science
    • RHS research
    • Type
    • Uncategorized
    • Welcome
  • Meta

    • Register
    • Log in
    • Entries RSS
    • Comments RSS
    • WordPress.org
    • RSS - Posts
    • RSS - Comments
  • Subscribe to Blog via Email

    Enter your email address to subscribe to this blog and receive notifications of new posts by email.

  • Privacy & Cookies: This site uses cookies. By continuing to use this website, you agree to their use.
    To find out more, including how to control cookies, see here: Cookie Policy
Culham Research Group
Proudly powered by WordPress.
loading Cancel
Post was not sent - check your email addresses!
Email check failed, please try again
Sorry, your blog cannot share posts by email.
%d bloggers like this: