Pests and Weeds

Marestail or Horsetail is a plant that has been around for millions of years. It is difficult to eradicate due to its tough foliage, creeping rhizomes and deep roots which can go down several feet. It has the potential to infest 1 hectare of land (40 allotments) within 6 years of introduction. There is no sure-fire quick way to eradicate this weed. A combination of the methods below will probably be needed over multiple seasons.

Chemical Control

· Glyphosphate – May take up to 5 spray applications, with a systemic glyphosphate such as Roundup or Tumbleweed. Works best when the leaves are crushed and bruised as they have a waxy coating which prevents absorption. Roundup and Tumbleweed are also available as brush on gels, or alternatively a batch can be made up with wallpaper paste to brush on which helps the chemical stick to the plants.

· Ammonium Sulphamate – Also known as Amicide, is more effective than glyphosphate but no longer sold as a weedkiller. It is however still available as a compost accelerator. Bruise plants and spray with a strong mixture. Add detergent to the spray to improve effectiveness.

· Kibosh or Kurtail – Specialist Marestail killer, usually requires two applications. This strong weedkiller is expensive and may require a licence/training to purchase and use depending on supplier.

· Lime – Marestail prefers an acid soil, so raise the pH by adding lime.

Physical Prevention

· Digging – dig out as much as you can being careful not to leave any of the shoots, roots or rhizomes behind.

· Black plastic membrane – Covering the affected area with black plastic may take two years to kill the plant. Don’t use a fabric membrane as the plants will grow through.

· Hoeing - Before the shoot reaches 3” hoe it off under the surface, being careful to remove the pieces that you’ve hoed off. This will gradually weaken the plant over time.

· Competing plants – some people report that Marestail doesn’t like competing with turnips, parsnips or potatoes. It does not cope well with shade.

Japanese Knotweed