Safety Signs Ireland is temporarily ceasing production and trading. We will review the situation in the Republic of Ireland on the 1st of June 2020.

Japanese Knotweed Warning Sign

New Japanese Knotweed Warning Sign

Japanese Knotweed Warning Sign

The images accompanying this post are of Japanese Knotweed an invasive plant that is currently widespread in Ireland. If you have Japanese Knotweed on your property you need to erect a sign warning passersby not to interfere with it. Even a passerby just breaking the stem can aid in spreading its highly pernicious rhizomes on your property.

If left untreated Japanese Knotweed will destroy pastureland, and undermine buildings, roadways, and other structures on your property.

The only way to effectively combat a Japanese Knotweed invasion is by treating it with suitable herbicides over a number of years. Cutting it will only further spread the rhizomes and the cut plant itself will regenerate as the roots can take hold up to 2 meters underground. 

You can select from a full range of materials and sizes to find the right fit and price point for your requirements including:

·         3mm Dibond Aluminium

·         5.5mm Corriboard

·         3mm Corriboard

·         Foam PVC

·         Vinyl


All our signage comes fully laminated to ensure that it has longevity and holds up to weathering. We do however offer an non-laminate corriboard for cheaper temporary signage. 

For long lasting outdoor and industrial signage we recommend 3mm Dibond Aluminium with a fully laminated finish. 


We also quote for large corporate orders, and if you are unsure or want some guidance on what your business requires then perhaps one of our free safety sign and equipment audits is for you. You get more information at the following link:


***If there is any type of signage you require that you cannot find here please e-mail us on or telephone +353 (0)61 513077 and we will provide you with an immediate quote. Prices for bespoke signs are generally in line with signs featured here and will only vary if very intricate graphic design work is involved. ***

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  • Product Code: 2343
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Tags: japanese, knotweed, warning, sign, feirmeoireacht, farming