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Weed Control


Weed Control


The old-fashioned way of removing those unwanted weeds is to do it manually, but sometimes we don't have the time.

It is possible to treat large areas quickly and with little effort by using chemical weed killers. When digging out weeds or hoeing, the gardener will bring thousands of weed seeds to the surface where they will find the right conditions to germinate. This is not the case with chemical control which does not disturb the soil.

We've covered a few ways of controlling the weeds in your garden, with recommendations on the products to use.

Contact Weed killers

These work on contact with the leaves of the plant. They start to work as soon as they are applied to the plant. After as little as 10 minutes some treatments are impervious to rain. They are fast-acting. Leaves turn yellow then brown. It’s all over in a few days. New plants can be planted or seeds sown straight after the initial application has dried on the weed leaves.

Thompsons Recommend

Pathclear: It works by killing the existing leaves and roots, and creating a barrier in the soil preventing new weeds from growing for up to 3 months. It is effective against annual and perennial weeds.





Systemic Weed killers

They kill from the inside out. Penetration through the leaves takes some time and effectiveness can be reduced if it rains within 6 hours of application. Once absorbed they travel throughout the plant, down to the very tips of the roots. A job this thorough takes time. The weeds in question should be left undisturbed for a week. Initial effects are normally evident within 7-10 days and complete weed control in 3-4 weeks.

Thompsons Recommend

Roundup Weed killer: This systemic weed killer goes in through foliage and moves right down to the root tips to kill off the whole plant.

Tumbleweed Ready To Use: TumbleWeed kills from the inside out - right down to the deepest root. A job this thorough takes time, with initial effects normally evident 14 days after application.





Residual Weed killers

These work by creating a barrier in the soil to prevent weed seeds germinating. They are held in the soil surface for several months.

Thompsons Recommend

S.B.K: selective weed killer for brambles, nettles, dock, woody weeds and hardwood saplings in grass and other neglected non-crop areas.




Selective Lawn Weed killers

These are very clever, they work on the broad-leaved weeds but not on the grass around them. They also work very differently from other types of weed killer. They actually stimulate growth, but it’s a rate of growth that can’t be sustained. The weed can’t get enough energy and it literally ‘grows itself to death’. They take some time to work - possibly up to 4 to 6 weeks - slower when it is cold, quicker in good growing conditions, warm, moist soil and when weeds are growing actively. One application can last for a whole season.

Thompsons Recommend

Verdone Extra: Specially formulated to kill the broad leaved weeds that invade lawns and suffocate grass. It works by stimulating growth at a rate that the weeds cannot sustain, in effect causing the weed to ‘grow itself to death’.


Verdone extra

Other Methods of Weed Control

Hand Weeding

Hand Weeding: Grasp the weed as close to the ground as possible and steadily pull it out (roots and all) - fine for the odd one or two but back breaking if the weeds are rampant. Ineffective with deep rooted or rhyzome type weeds.

Digging or Forking Out

Even more strenuous than hand weeding and care must be taken to remove every bit of the offending plant and roots without damaging the plants to be kept. Any bits of roots left will propagate new plants. Click here to view our Digging tools

Hoeing Off

‘Topping’ the weeds with the hoe blade just below the soil surface avoids some of the backache but the weeds still have to be picked up. Hoeing the roots of perennial weeds often increases the problem and brings the seeds of annual weeds back to the surface. Less effective in wet weather, hoeing perennial weeds often increases the problem. Hoeing Tools