Valdor® Flex Long Lasting Weed Control

SKU: 188871

Option: 10 x 10 g Sachet
Sale price£34.95 ex. VAT
£41.94 inc. VAT
(minimum of 1)


MAPP 20240

Active Substance: 360 g/kg diflufenican, 10 g/kg iodosulfuron-methyl-sodium

Product Overview
Product Type Herbicide
Product Name Valdor® Flex
MAPP No. 20240
Active Substances Diflufenican and Iodosulfuron-methyl-sodium
Formulation Water dispersible granule
Areas of Use Amenity vegetation (around), hard surfaces (railway ballast only), natural surfaces not intended to bear vegetation, permeable surfaces overlying soil
Amateur/Professional Professional
Phytomobility Residual
Mode of Action Group Inhibition of pigment synthesis and Inhibition of ALS

Valdor® Flex is a residual herbicide for pre-emergent & early post-emergence application. It controls a broad spectrum of annual and perennial broad-leaved weeds on amenity vegetation (around) natural surfaces not intended to bear vegetation, permeable surfaces overlying soil, and hard surfaces (railway ballast only). It can be applied once per year at a rate of 0.5 kg/ha.

Please note: packaging may vary.

Key Features

  • Can be used to ensure that paths, hard surfaces and the ground around ornamental plants and trees remains weed free
  • Ideal for use by local authorities, county councils, highways maintenance, vegetation management contractors, landscapers and many others
  • Due to the long-lasting residual activity of Valdor® Flex, a weed free environment can be achieved alongside a reduction in the amount of herbicide applied

Valdor® Flex should be applied pre– or post-emergence of the plant species to be controlled. The combination of the two active substances in Valdor® Flex means that any very young plants that are present at the time of spraying will be controlled as well as providing a residual effect for up to four months. This ensure a long lasting, weed free environment.

If larger weeds are present, Valdor® Flex can be applied with glyphosate or a fatty acid to achieve control of the existing vegetation.

The 500 g container comes complete with a measuring cup for ease of use and is ideal for those needing to keep larger areas weed free. The 500 g container is sufficient to treat 1 ha.

Valdor® Flex sachets are a cost effective solution to keep natural surfaces, such as open soil, gravel and industrial areas, weed free for up to 4 months. The 10 x 10 g sachets provide a convenient method of treating smaller areas. Each sachet can be mixed with 6-10 litres of water in a knapsack sprayer providing surface coverage up to 200 m2.

Target Species

Valdor® Flex gives pre– and early post-emergence weed control up to the two leaf stage of annual and perennial broadleaved plants and grasses. It will not control deep rooted perennial plants such as dandelion, thistle or nettles once they are established.

A selection of the plant species that are controlled by Valdor® Flex are listed below (please read the label for the full species list):

Grasses Annual Herbs Perennial Herbs Woody Plants
Annual meadow-grass (Poa annua)
Cocksfoot (Dactylis glomerata)
Bristly ox-tongue (Picris echioides)
Dove’s foot crane-bill (Geranium molle)
Common groundsel (Senecio vulgaris)
Hairy bitter cress (Cardamine hirsuta)
Knotgrass (Polygonum aviculare)
Mayweeds (Matricaria spp.)
Shepherd’s purse (Capsella bursa-pastoris)
Black medick (Medicago lupulina)
Dandelion (Taraxacum officinale)
White clover (Trifolium repens)
Greater plantain (Plantago major)
Ribwort plantain (Plantago lanceolata)
Persian speedwell (Veronica persica)
Rosebay willowherb (Chamerion angustifolium)
Yarrow (Achillea millefolium)
Cinquefoil (Potentilla fruticosa)

Instructions for Use

Where to use

For use on:

  • Amenity vegetation (around) - Areas of bare soil around ornamental plants or intended for ornamental planting
  • Natural surfaces not intended to bear vegetation - Areas of soil or natural outcroppings of rock that are not intended to bear vegetation
  • Permeable surfaces overlying soil - Any man-made permeable surface (excluding railway ballast) that overlies soil and is not intended to bear vegetation
  • Hard surfaces (railway ballast only) - Any man-made impermeable surface that is not intended to bear vegetation

When to use

Valdor® Flex can be applied at any time of year but is most effective when applied pre- or early post-emergence of weeds (up to the 2 leaf stage).

Application Window
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

How to use

500 g

Maximum Treatments Pack Coverage Application Rate Water Volume Application Method Spray Quality
1 per annum 1 ha 0.5 kg/ha 300 - 500 L/ha Conventional knapsack sprayer Coarse


Maximum Treatments Pack Coverage Application Rate Water Volume Application Method Spray Quality
1 per annum 10 x 200 m2 ha 0.5 kg/ha 300 - 500 L/ha Conventional knapsack sprayer
Vehicle mounted sprayer
Three star drift reduction

  1. Add half the required water to the spray tank
  2. Add the required amount of Valdor® Flex to the spray tank
  3. Agitate the spray tank to ensure the granules are fully dispersed
  4. Top-up the spray tank with water to the required level

Additional Information

  • Valdor® Flex can be applied during cold weather but application to frozen ground should be avoided
  • Do not apply to plants growing under stressful conditions as this may reduce levels of control
  • Where Valdor® Flex has been applied to sites which are subsequently to be cleared or cultivated; a period of six months should elapse between treatment and the sowing or planting of subsequent crops AND the soil should be deeply cultivated
  • Avoid contact with non-target plants
  • Diflufenican will build up in the soil when Valdor® Flex or other products containing diflufenican are used in successive years
  • For maximum efficacy ensure good coverage and do not cultivate or rake the area after application
  • DO NOT apply over drains, or in drainage channels, gullies or similar structures for moving water

Active Substances


Bio-Chemical Mode of Action: Diflufenican belongs to the inhibition of pigment synthesis group of herbicides.
Pigment inhibitors work by interfering with pigment production, leaving the chlorophyll unprotected from sunlight. As a result, the cell contents are destroyed rapidly.

Mobility: Diflufenican is a residual herbicide with xylem mobile activity which means that as susceptible plants come into contact with the active substance, it is absorbed through the leaves and roots then moves upwards through the plant within the xylem (water conducting tissues).

Application timing: Pigment inhibitors should be applied pre– or early post-emergence. If applied post-emergence, they are most effective when target plants are small.


Bio-Chemical Mode of Action: Iodosulfuron-methyl-sodium belongs to the ALS (Acetolactate Synthase) Inhibitors group of herbicides.
Acetolactate synthase is an important enzyme involved in the biosynthesis of branched-chain amino acids. ALS inhibitors interrupt this process causing the plant to initially become chlorotic before necrosis of plant tissues followed by whole plant death occurs.

Mobility: Iodosulfuron-methyl-sodium is a residual herbicide with xylem and phloem mobile activity which means that as susceptible plants come into contact with the active substance, it is absorbed through the leaves and roots then moves to areas of new growth within the xylem (water conducting tissues) or phloem (sugar conducting tissues).

Application timing: ALS inhibitors are best applied when the weeds are actively growing. They are more effective when target plants are young and in their vegetative phases.

Customer Testimonial

"Putting Valdor® Flex to the test on a heavily weeded gravel site at an international airport was a chance to find out if it would live up to expectations. Long-lasting residual control and ability to minimise resistance were two qualities we were looking for in the product, and we were very impressed by both aspects.

Herbicide resistance is becoming a real issue in the amenity sector, so the fact the product brings new chemistry to our armoury is key. We also found it was particularly clean and easy to work with. There was no foaming in the tank, so the job was swiftly completed. In this trial we combined Valdor® Flex with glyphosate due to size of the weeds."

Alan Abel

Complete Weed Control South and Central Wales

For further information on Valdor® Flex, please contact a member of our technical sales team on 01952 897917.

Find more information in our guide How To Know Which Herbicide to Choose

Technical Information

SKU Product File
188871 10 x 10 g Sachet Safety Data Sheet (PDF)
188871 10 x 10 g Sachet Product Label (PDF)
188871 10 x 10 g Sachet Product Brochure (PDF)
185211 500 g Safety Data Sheet (PDF)
185211 500 g Product Label (PDF)
185211 500 g Product Brochure (PDF)

Safe use of pesticides

The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Please be aware that by proceeding you are purchasing a professional pesticide product.

You must ensure the end user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides:

"By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out."

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