Yes is mature once preflowers are present, l flower smaller plants and a 1ft seedling can get very big during preflower and into flowering, l go by 3x the size when done or more, strain dependant. After growing once you get better idea what theyll do. All plants are very from each other, why most use cuts not seeds, more uniform garden. They look good btw! Happy girls. Do all bug spraying b4 you think of flowering. Make sure is growing well too. Growth will go on into flower cycle. Best of luck with crop! Dont forget to update.