Tree work07884 274693Training01772 369694
Japanese knotweed moves fast. Leave it unchecked and it can disrupt programmes, escalate costs and create real risk around neighbours, waterways and utilities. Act early and you reduce disturbance, control budgets and keep your schedule on track.
We identify, treat and remove Japanese knotweed across Preston and Lancashire with clear plans, safe methods and well-managed site logistics. You get practical advice from day one, delivered by an ARB Approved Contractor with proven accreditations, and a team that integrates easily with wider site clearance and tree surgeons operations.
Early identification saves time and cost. Look for bamboo-like canes, a zig-zag pattern on new growth, broad green leaves with a pointed tip, creamy-white flower clusters in late summer, and dead canes that persist through winter. The real risk sits underground: rhizomes spread laterally and even small fragments can regenerate.
Common hotspots
Immediate site controls
Keeping programmes moving means preventing spread and documenting every step. We isolate stands, segregate and label arisings, use competent operatives for herbicide handling, and plan any waste movement via licensed carriers with appropriate records.
Your management plan includes:
We recommend methods based on risk, access and programme.
Targeted herbicide
Planned applications during active growth using foliar spray or stem injection for sensitive areas. Precise dosing, careful drift management and clear visit schedules.
Excavation and removal
Supervised excavation to agreed depths and offsets, segregated loading to sealed transport, validation before backfill, and chain-of-custody documents.
On-site containment
Engineered barriers or relocation to a designated cell, then long-term monitoring where ground conditions and design allow.
We sequence controls around your critical path:
Risk is managed through task-specific RAMS, competent teams, COSHH controls and well maintained equipment. Public and traffic interfaces are protected with barriers, briefings and banksmen, while utilities are managed via service plans and permit-to-dig processes. Competence is maintained through ongoing arboriculture training.
Choosing the right team for knotweed control saves time, reduces risk and keeps neighbours on side. Here is what sets us apart in Preston and across Lancashire.
Get in touch with Great Oaks today. We’re happy to answer any questions relating to arboriculture or grounds maintenance, or provide further info about our chainsaw courses.
Routine grounds maintenance helps prevent accidental spread, keeps exclusion zones visible and maintains safe access for inspections
Our qualified tree surgeons manage canopy reductions, removals and root protection where knotweed interfaces with trees or shelters.
We phase knotweed operations alongside site clearance so haul roads, compounds and service strips can progress safely without disturbing contaminated soils.
Where development constraints are complex, our in-house arboriculture services provide surveys, method advice and supervision to keep plans compliant.
Teams stay current through ongoing arboriculture training, including safe chemical handling, plant operation and on-site briefings.
You benefit from recognised standards, supported by our audited accreditations for quality, safety and environmental management.
What affects cost
Extent and density, access and working room, chosen method, interfaces and risk, any waste movements, and monitoring duration.
Typical durations
Your journey
Initial desktop advice, site survey and proposal, mobilisation with exclusion measures, supervised delivery, scheduled monitoring, and close-out with a tidy document pack.
Will Japanese knotweed come back after treatment?
Effective control is achieved through a planned programme and monitoring. If regrowth appears, we schedule follow-up treatments under the same management plan until control is verified.
How quickly can work start in Preston and across Lancashire?
We mobilise promptly once the survey is complete and RAMS are agreed. For excavation, start dates are set around plant availability and traffic or permit requirements.
Is excavation always faster than herbicide treatment?
Excavation clears an area quickly, which helps time-critical schemes. Herbicide is often the least disruptive approach for perimeters and sensitive areas. We will recommend the method that best fits your constraints.
What happens to contaminated soil and arisings?
Where removal is required, materials are handled under strict controls and transported by licensed carriers to appropriate destinations. Chain of custody records are issued with your close-out pack.
Can routine maintenance continue around the stand?
Yes, with controls. We brief operatives, mark exclusion zones and align with your regular grounds maintenance regime so mowing, strimming and flailing do not disturb contaminated areas.
What accreditations do you hold?
Great Oaks is proud to hold ARB Approved Contractor status, together with Constructionline Gold and ROSPA memberships. For a full overview, see our accreditations page.
Tell us about your site and we will come back with clear next steps, realistic timescales and a fixed price where scope is defined. Send drawings, photos, access notes and any known constraints. If you have programme dates, include those so we can align treatment windows or excavation.
To get in touch with us, you can either:
Careers
Climbing, grounds maintenance and utility work.Climbing, grounds and utility work.
Arboricultural Association Approved Contractor.
Last minuteAvailability
Starts Monday 19 October 2026
3 days plus 1 for assessment
£9671 place
Entry requirements: Ground Based Chainsaw Operator and Tree Climbing and Aerial Rescue
Book this date, Using a Chainsaw from a Rope and HarnessOr call the training office on 01772 369694
