people have told me that bud plants are fully grown after 6 years and people have told me 20 years. i have read that the more light you give them befor budding (like 18hours of light/6 hours of dark) the better the buds which i bet is true and some times even if you have the plants light on 24/7 they still might bud them selfs (iv read that to) but thats rare. i personnaly think they would keep growing but i could be wrong.