The owner of the Nirvana chain of head shops, Jim Bellamy, has denied plant cultivation kits being sold in his outlets and on his websites are encouraging people to grow cannabis plants.
Mr Bellamy told The Irish Times the equipment his shops sells are sold for "horticultural purposes".
"We don’t selling anything to people so that they can grow cannabis," he said.
While his shops were also selling cannabis seeds, he said the seeds were not banned here and were only sold by his outlets as "souvenirs".
"We have always sold them as souvenirs, it’s something that we’ve done as a tradition really."