There are plenty of different ways of getting rid of the invasive weed.
Cutting Japanese knotweed for example, will not eradicate its growth and it should be seen as short term Japanese knotweed control only. Japanese knotweed control and Japanese knotweed removal is most effective when used in conjunction with herbicide treatment. Cutting the weed could actually increase the risk of spreading it.

Pulled stems of Japanese knotweed often have the highly invasive Japanese knotweed crown material attached to them and must be disposed of in the same way as the Japanese knotweed rhizome. Cut Japanese knotweed stems are less of a risk, and are safe once the Japanese knotweed stems have dried out and turned brown. Japanese knotweed stems should be cut cleanly so that they don’t create pieces of Japanese knotweed stem that may spread and regenerate Japanese knotweed, in addition Japanese knotweed stems should be left where they can dry out fully. If you intend to treat Japanese knotweed re-growth with herbicide, you should remove cut Japanese knotweed material from the Japanese knotweed treatment area to allow the spray to effectively cover the new Japanese knotweed growth.

Japanese knotweed can regenerate from just a small piece of stem and drying canes should be left on an appropriate membrane surface, not on soil or grass. Once the Japanese knotweed stems have dried to a deep brown colour they are dead. This is not the case with Japanese knotweed crown or rhizome material though.

A more efficient way for Japanese knotweed eradication is by using controlled burning of the stem, rhizome and crown material as part of any on-site management programme for Japanese knotweed eradication. Burning will not eradicate the plant completely. However, by burning there is less material to bury or dispose of off-site.

Any above ground treatment of Japanese knotweed or Japanese knotweed contaminated soil may require a Mobile Plant Licence. Section 35 of the Environmental Protection Act 1990 makes provision for two types of waste management licence.

The first one is relating to the treatment of the plant, keeping or disposal of Japanese knotweed waste in or on specified land, or relating to the treatment of Japanese knotweed or disposal of any specified description of controlled weed waste by means of specified mobile plant.

Mobile plant is a plant which is designed to move or be moved whether on roads or land.

Under Regulation 12 of the Waste Management Licensing Regulations 1994, as
amended, it is possible to apply for a mobile plant licence for, amongst other things like the treatment of waste soil from Japanese knotweed removal, the treatment of contaminated material, substances or products for the purposes of remedial action with respect to land or the water environment.

A licence will specify the type of mobile plant that can be used for treatment of Japanese knotweed controlled waste.

On-site burial of Japanese knotweed is actually not considered to be landfill and will be allowed without a licence, as long as the Japanese knotweed waste is re-used on site when made safe after Japanese knotweed control, has an identified use within the site as part of a development plan, or when there is no import of Japanese knotweed waste material for infill purposes.