Ferns Garden Myths Gardening Weeds

Garden Myth: Lime Can Control Horsetail

20180809A ENG quotesk.com, www.atlantisskincare.com & worldartsme.com.jpg
Will lime really kill horsetail? Not unless you apply it in industrial quantities! Source: quotesk.com, http://www.atlantisskincare.com & worldartsme.com, montage: laidbackgardener.com

Most garden myths have some element of truth. Such is the case of the one that insists you can control field horsetail (Equisetum arvense), also called common horsetail, a very invasive weed, by applying lime. You actually could eliminate horsetail with abundant applications of lime… but you won’t want to. And here’s why:

The proponents of the “lime controls horsetail” belief insist that field horsetail grows only in acidic soils. It therefore seems logical that, if you make the soil more alkaline, it ought to make conditions hostile enough that horsetail would die out.

But the first bit of information is wrong. Yes, horsetail does grow in acid soil, but it’s hardly exclusive to that soil type. It also thrives in neutral soils and does well even in moderately alkaline soils. (What it does like is moist soil, but that’s a different story.) It takes a very high pH (greater than 7.6) to seriously begin hampering the rampant growth of this common weed… but if your bring your garden soil to pH of 7.7 or above, you’ve essentially poisoned it: almost no garden plant you would think of growing will thrive in soil that is that alkaline! And I doubt if applying a “scorched earth policy” to your garden was what you had in mind!

Spread the Word

20150802BThis myth about horsetail is still widely shared by well-meaning gardeners, even horticultural professionals. Yet anyone who has ever tried to control horsetail with lime will tell you it’s simply a waste of time and money.

This is one garden myth that really deserves to die … so please don’t hesitate to share the real situation with your gardening friends.

But How Then Can You Get Rid of Horsetail?

Actually getting rid of horsetail is no easy task, but I’ll give a few suggestions in tomorrow’s blog, so … patience!

Larry Hodgson is one of Canada’s best-known garden communicators. He has notably been editor-in-chief of HousePlant Magazine, Fleurs, Plantes et Jardins, À Fleur de Pot and Houseplant Forum magazines and is currently the garden correspondent for Le Soleil and radio garden commentator for CKIA-FM Radio. He has written for many garden publications in both the United States and Canada, including Canadian Gardening, Harrowsmith, Horticulture, Fine Gardening and Organic Gardening. He also speaks frequently to horticultural groups throughout Canada and the U.S. His book credits include The Garden Lover’s Guide to Canada, Complete Guide to Houseplants, Making the Most of Shade, Perennials for Every Purpose, Annuals for Every Purpose, and Houseplants for Dummies, as well as nearly 60 other titles in English and French. He is a past president of the Garden Writers Association (now Garden Communicators International) and the winner of the prestigious 2006 Garden Media Promoter Award offered by the Perennial Plant Association. He resides in Quebec City, Quebec, Canada.

2 comments on “Garden Myth: Lime Can Control Horsetail

  1. Carole Senda

    How to rid a flower bed of horsetail

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