Synero 3L is a highly effective herbicide that provides targeted control of broadleaf weeds in grassland, amenity areas, and non-crop land. With its innovative formulation, Synero works efficiently by targeting the weeds while leaving the surrounding grass unharmed. This makes it ideal for use in forestry, parks, lawns, and agricultural areas, providing professional users with reliable results.
The active ingredient in Synero is fluroxypyr, a selective herbicide that delivers fast and consistent control of broadleaf weeds. Synero is especially effective against tough, persistent weeds such as dock, thistles, ragwort, and dandelions, making it a must-have in any weed control programme.
Features & Benefits
Selective control of broadleaf weeds without harming grass or crops
Fast-acting formulation with visible results within 7-14 days
Fluroxypyr-based herbicide for high efficacy on difficult-to-control weeds
Suitable for use in amenity grasslands, forestry, pastures, sports pitches, and non-crop areas
Ideal for professional landscapers, farmers, land owners, and councils
Easy-to-use liquid formulation, making application quick and efficient
3L pack size is convenient for smaller and medium-sized applications
Application Rates
For General Weed Control: Apply 4-6L per hectare in 100-200L of water (depending on weed density)
Spot Treatment: Apply directly to weeds using a knapsack sprayer at a rate of 40ml per litre of water
Boom Sprayer Application: For larger areas, apply at a rate of 4-6L per hectare using appropriate dilution
Best Application Timing: Apply when weeds are actively growing and have fully emerged, typically in spring to early autumn
Note: Always follow the label instructions for specific application rates, safety precautions, and environmental guidelines.
Type of Weed Control
Selective herbicide designed for broadleaf weed control
Systemic action targets weeds, delivering control through root absorption
Non-residual, allowing grass and other non-target plants to thrive post-application
Weeds Targeted
Dandelions, ragwort, dock, thistles, and other common broadleaf weeds
Effective against a range of persistent perennial weeds that are typically hard to manage
Provides control of woody shrubs and other unwanted vegetation in amenity grasslands and non-crop areas
Active Ingredient
Fluroxypyr (200g/L)
Areas of Use
Forestry (woodlands, tree plantations)
Amenity grasslands (lawns, parks, sports pitches)
Pastures and agricultural land for weed control in grassed areas
Non-crop areas such as roadsides, railways, and industrial land
Coverage
1L pack covers approximately 1 hectare, based on the recommended dilution rate and application method
Spot treatment coverage will vary depending on weed density and size of the treatment area
MAPP Number
MAPP No: 18578
Period of Use
Effective from spring to autumn during active weed growth
Avoid application during frosty or extreme drought conditions for best results
Not to be used when weeds are stressed due to weather conditions
Professional Use Notice
Synero 3L is a professional use herbicide and should be applied by those holding the appropriate PA1 and PA6 certification. It is vital to comply with UK pesticide regulations and ensure all safety precautions and environmental guidelines are followed during application.
Why Order From Green-tech?
Specialist supplier for professional landscapers, councils, farmers, and grounds maintenance teams
Fast and reliable delivery across the UK
Access to a wide range of weed control, fertilisers, and land management products
Expert advice and technical support for safe and effective herbicide application
Bulk ordering options for large-scale projects
Please Note:
This product is dispatched directly from our trusted supplier’s warehouse. While we aim to keep product availability as accurate as possible, we do not have live stock control for these items. Availability is subject to change, and delivery can take up to 15 working days, depending on stock levels at the time of order.
Tracking information will be provided where available, but please note this is dependent on the supplier’s shipping process. If you have any questions about lead times or delivery, our team is happy to help before you place your order.

Specification Detail
Application Rate 4-6L per hectare for general use, 40ml per litre for spot treatment
Weeds Targeted Dandelions, ragwort, dock, thistles, and other broadleaf weeds
Active Ingredient Fluroxypyr (200g/L)
MAPP Number 18578
Areas of Use Forestry, amenity grasslands, pastures, non-crop areas
Coverage 3L = Approx. 1 hectare
Period of Use Spring to autumn, avoid frost or drought conditions