Japanese knotweed,
identified.
Photograph a suspect plant and get a clear verdict in seconds - then a risk assessment, a report you can keep, and a real surveyor's confirmation when it counts.
Caught early, knotweed is manageable. Missed, it becomes expensive.
Most people only discover Japanese knotweed when a survey flags it mid-sale. KnotweediD puts a fast, credible first answer in your pocket - long before it costs you.
Not just another weed
One of the UK's most persistent invasive plants - and catching it early is what keeps it simple and inexpensive to deal with.
Property value
Left untreated it can complicate a sale or mortgage - but a managed, documented plan usually keeps things on track.
Mortgages
Most lenders will lend with a professional treatment plan and insurance-backed guarantee in place.
Legal duty
Letting it spread to neighbouring land can lead to claims; sellers must declare it on the TA6 form.
It spreads fast
Growing up to 10cm a day in summer, it can push into existing cracks in tarmac, drains and paving.
Everything you need, in one place
From a first photo check to a report you can hand to a surveyor or solicitor - KnotweediD walks you through every step.
Photos that actually get a result
No guesswork. The app tells you exactly which shots to take - and tags each one so the identification engine reads it properly.
- ✓ Guided prompts for leaves, stem and whole plant
- ✓ Snap fresh photos or upload from your gallery
- ✓ Each shot organ-tagged for higher accuracy
A clear answer, with the reasons
Get a verdict in seconds and a plain-English breakdown of which tell-tale knotweed features were - and weren't - present in your photos.
- ✓ Clear "likely knotweed" or "likely not" verdict
- ✓ Match strength, never a confusing percentage
- ✓ Honest about uncertainty - no false alarms
Understand the risk, keep a record
A few quick questions about the site set your risk level. Then save a dated PDF report with your photos and a site map - perfect for an agent, surveyor or solicitor.
- ✓ Boundary proximity, spread and maturity assessed
- ✓ Downloadable PDF report with your photos
- ✓ Recommended next steps for your situation
Map every stand, monitor over time
Drop GPS markers where you've found knotweed, outline the affected area, and add progress photos to watch spread or treatment - all kept privately on your device.
- ✓ Pin knotweed on a real map
- ✓ Add dated progress photos per marker
- ✓ Private by design - stored on your phone
A report you can hand
to anyone
Not a screenshot - a dated, case-numbered PDF your estate agent, surveyor, solicitor or lender can actually use.
- AI first-check and the surveyor's written verdict
- Site risk assessment - boundary, spread, maturity
- Your photographs and site map, all in one record
- Reviewed by a PCA CSJK accredited surveyor
Included with a Confirmed Report · £9.99 · one property
Get your report ready →
How to spot Japanese knotweed
Four features give it away. KnotweediD checks for all of them in your photos - here's what the experts look for.
Shield-shaped leaves
Lush green leaves with a flat base and pointed tip, up to 14cm across, arranged in an alternating zig-zag along the stem.
Hollow speckled stems
Bamboo-like canes, green with distinctive purple-red speckles and raised nodes - hollow inside, reaching 2-3m tall.
Creamy-white flowers
In late summer and early autumn, dense clusters of tiny creamy-white flower tassels drape along the stems.
Dense zig-zag growth
Forms thick, established stands that crowd out other plants - in spring it emerges as red-tipped, asparagus-like shoots.
Knotweed through the year
It looks completely different by season - which is exactly why so many people miss it. Here's what to watch for, month by month.
Spring shoots
Red-purple, asparagus-like shoots push up fast, unfurling rolled dark green leaves on reddish stems.
Summer canes
Tall green bamboo-like canes with lush shield leaves form dense stands 2-3m high - its most recognisable form.
Autumn flowers
Sprays of creamy-white flowers appear, then the leaves yellow and fall as the plant heads for dormancy.
Winter canes
Leaves drop and canes die back to brittle, orange-brown hollow stems that stand through winter - still a clear sign.
Tell it from its look-alikes
Plenty of harmless plants get mistaken for Japanese knotweed. KnotweediD is built to spot the difference - and is honest when your photos point elsewhere.
Bindweed
Heart-shaped leaves on a twining vine with white trumpet flowers - not knotweed's flat-based shield leaf.
Dogwood
Leaves grow in opposite pairs, with tell-tale red winter stems.
Lilac
A woody shrub with fragrant spring blossom and no hollow, speckled cane.
Himalayan honeysuckle & bamboo
Often mistaken for the canes - but neither shows knotweed's zig-zag shield leaves.
How it works
Three steps from "is that knotweed?" to a report you can act on.
Snap or upload
Follow the guided prompts for a few clear photos of the leaves, stem and whole plant.
Get your verdict
See a clear result in seconds, with the features that matched and a site risk assessment.
Act with confidence
Save a report, map the site, or have a real accredited surveyor confirm it with iD Pro.
Confirmed by a real surveyor
For total peace of mind before a sale, purchase or treatment, a PCA CSJK accredited surveyor personally reviews your photos and confirms whether it's Japanese knotweed - a real expert, not AI.
Built on real knotweed expertise
Anyone can build a plant-spotting app. KnotweediD is grounded in the standards the UK property and surveying industry actually relies on.
Accredited standards
Our confirmation service is delivered by surveyors holding the PCA's CSJK qualification - the recognised mark of Japanese knotweed competence.
PCA · CSJKA real human in the loop
Where it counts, a qualified surveyor personally reviews your photos - so you get expert judgement, not just an algorithm's best guess.
Human verifiedMade & supported in the UK
Designed for UK gardens, UK property law and UK lenders - and backed by a team you can actually reach.
UK based
Every confirmed report is reviewed by one of these three surveyors, accredited by the Property Care Association →
Japanese knotweed questions
The things people most want to know about identifying and dealing with knotweed.
How do I identify Japanese knotweed?
Photograph the leaves, stem and whole plant. KnotweediD checks the tell-tale features - zig-zag, shield-shaped leaves with a flat base and pointed tip, a hollow speckled bamboo-like stem, and a dense growth habit - and gives you a clear verdict in seconds, explaining which features were and weren't present.
Is the app accurate?
A photo check is a fast, reliable first step, but it's a guide rather than a legal clearance. Young shoots, winter canes or a partial photo can hide knotweed. For a sale, mortgage or boundary dispute, KnotweediD lets a PCA CSJK accredited surveyor personally confirm your photos through the optional iD Pro service.
Does knotweed affect my mortgage or house sale?
Japanese knotweed can affect mortgage lending and property sales, and there are disclosure obligations when selling. KnotweediD helps you find out quickly whether you have it, gauge how serious it is, and produce a dated report you can share with a surveyor, solicitor or managing agent.
What plants are mistaken for knotweed?
Bindweed, dogwood, lilac, Himalayan honeysuckle and bamboo are all commonly confused with Japanese knotweed. The app includes a look-alikes guide to help you tell them apart.
How do you get rid of Japanese knotweed?
The main options are a multi-year herbicide treatment programme or physical excavation and removal of the contaminated soil. For a mortgage or sale, lenders typically want a professional plan with an insurance-backed guarantee. KnotweediD helps you identify and document the problem so you can brief a specialist accurately.
Can I remove knotweed myself?
You can, but it's risky: knotweed regrows from tiny fragments of root, and it's classed as controlled waste, so disposal is regulated. DIY attempts often spread it further. Confirming what you're dealing with first - and getting professional advice for anything serious - saves money in the long run.
What does iD Pro cost?
iD Pro is a £12.99/month subscription you can cancel anytime. It unlocks the iD Pro Portal, where a PCA CSJK accredited surveyor personally reviews your photos and confirms whether it's Japanese knotweed, usually within 24 hours.
Learn to spot it yourself
Free, practical guides on identifying Japanese knotweed and telling it apart from common look-alikes.
How to identify Japanese knotweed
The five tell-tale features - leaves, stems, growth and flowers - and how they change through the seasons.
Read the guide → Look-alikes5 plants mistaken for knotweed
Bindweed, dogwood, lilac, Himalayan honeysuckle and bamboo - how to tell each one apart.
Read the guide →Know for sure in seconds
Identify Japanese knotweed, assess the risk, and act with confidence.
