Norwich has the largest number of Japanese knotweed infestations in Norfolk, according to new figures.
Japanese knotweed can cause severe damage to homes if left unchecked, with the potential to grow up through cracks in concrete, tarmac driveways, drains and cavity walls.
It is at its worst in the mid-summer and roots can grow as deep as three metres and spread up to seven metres horizontally.
Data compiled by Environet UK on its "exposed" tracker has found Norwich tops the rankings for the most infestations in Norfolk, with 77 recorded within a 4km radius.
Swardeston, a village four miles south of Norwich, had the second-highest number of infestations at 63.
Bramerton followed with 62, Sprowston with 59, and Eaton with 30.
In 2021, Trowse was found to have the highest number of infestations with 79 reports.
Japanese knotweed first arrived in the UK in 1850 in a box of plant specimens delivered to Kew Gardens.
Favoured for its rapid growth and pretty heart-shaped leaves, it was quickly adopted by gardeners and horticulturalists who were oblivious to its invasive nature.
People who spot an infestation, characterised by the plant's purple or red asparagus-like shoots, can mark it on Environet UK's online map.
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