Once the UK has left the EU, there will be new processes that importers must follow in 2021 when importing plants and plant products into GB from the EU.
‘Plant’ means a living plant (including or tree) or a living part of a plant (including a living part of shrub), at any stage of growth.
‘Plant product’ means products of plant origin, unprocessed or having undergone simple preparation, in so far as these are not plants, including wood and bark.
See the full guidance here.