Spring is Coming: How to Check Your Property for New Knotweed Growth
Old stalks tend to break off leaving a short stump connected to the “crown”, site of re-emergence for the new seasons growth
“Red blunt “growth tips” just visible through the previous season’s leaf and stem litter
March is the month when gardens begin to wake up. Days get longer, temperatures start to lift, and the first signs of spring appear across lawns, borders and hedgerows. It’s also the time of year when Japanese Knotweed starts to re-emerge,
often catching property owners off guard, especially if the plant “disappeared” over winter and seemed like it was no longer an issue.
Early detection is one of the most effective ways to reduce the cost, disruption and risk associated with knotweed. If you know what to look for in March, you can take action while growth is still limited and before the plant has time to establish momentum for the season.
Why March Matters for Knotweed
Japanese Knotweed is a perennial plant that dies back above ground in winter, but remains alive underground in its rhizome system. As soil temperatures rise in early spring, the plant begins to push up new shoots using energy stored in those rhizomes. This is why knotweed can appear suddenly, even on sites where you haven’t noticed it for months.
March is particularly important because growth is often at its most identifiable stage. The plant is young, shoots are fresh and distinctive, and there is less surrounding vegetation to obscure early signs. It’s also the best time to start planning treatment, as spring and summer are when management programmes are most effective.
Where to Check on Your Property
Knotweed doesn’t always appear in the centre of a garden. It often establishes in overlooked or hard-to-access areas, and it can spread from neighbouring land without you realising.
When checking your property in March, pay close attention to:
Garden boundaries, especially along fences and hedges where neighbouring growth may encroach.
Areas near outbuildings, sheds and garages where vegetation is rarely disturbed.
Riverbanks, ditches, railway edges or unmanaged land bordering your property.
Old “bare patches” where nothing else seems to grow well.
Previously landscaped or disturbed areas, as knotweed can spread via contaminated soil.
If you own or manage a commercial site, also check behind storage areas, along car parks, service roads, and any unused corners of the grounds where maintenance is less frequent.
What Early Knotweed Growth Looks Like
In early spring, Japanese Knotweed shoots can look unusual compared to other garden plants, but they are often mistaken for bamboo, peonies, or even emerging shrubs. The key is to look for a combination of features rather than relying on one sign alone.
In March, knotweed commonly appears as:
Small, red or purple-tinted shoots pushing up through soil or gravel.
Tightly rolled leaves that begin to unfurl as the shoot grows.
A “clustered” emergence pattern, with multiple shoots appearing close together.
Thick, fleshy stems that look more substantial than typical weeds at the same stage.
In areas where knotweed was present last year, you may also see old brown canes from previous growth. These can remain standing through winter and are a strong indicator that new shoots may appear nearby as spring progresses.
What Not to Do If You Suspect Knotweed
It’s completely natural to want to cut it back, dig it out, or dispose of it quickly. Unfortunately, knotweed is one of the few plants where the wrong action can make the problem significantly worse.
If you suspect Japanese Knotweed:
Avoid cutting, strimming or mowing it, as this can spread fragments.
Do not dig or remove soil, as rhizome pieces can regenerate.
Do not compost plant material or dispose of it in garden waste.
Avoid moving soil or starting landscaping until you have professional advice.
Knotweed is classed as controlled waste, and improper handling can lead to spread, enforcement action, and higher treatment costs later on.
When to Bring in a Professional
If you’ve seen anything suspicious, or you simply want reassurance, March is the ideal time to arrange an inspection. A professional can confirm whether the plant is Japanese Knotweed, assess how far it extends (including potential spread from neighbouring land), and advise on the most appropriate management plan.
This is particularly important if you are:
Planning to sell your property this year and want to avoid delays during the conveyancing process.
Buying a property and need clarity before committing.
Preparing for groundwork, extensions, landscaping or development.
Managing a commercial site where compliance and liability are key concerns.
Acting early gives you more options and avoids the spring rush, when survey and treatment slots can become limited.
Get Ready for the Growing Season
The good news is that knotweed is manageable when addressed properly. Treatment is most effective when planned and timed around the plant’s growth cycle, and starting early in the season gives the best chance of keeping the infestation contained and reducing long-term impact.
March is your opportunity to spot the first signs, get expert confirmation, and put a plan in place before growth accelerates in late spring.
Book Your Free Knotweed Inspection
Spring growth season is here, schedule a free Knotweed inspection before it spreads. Elcot Environmental can assess your property, confirm identification, and talk you through your next steps clearly and professionally.
Call: 01962 886210
Spring growth season is here, schedule a free Knotweed inspection before it spreads!
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