Hey there n1990 , so congrats ona great grow. You say it’s pretty standard but it’s been a hard strain to grow in the past, so you’re doing really well. Basically the plant responds to environmental triggers like light , temperature or in your case the nutrients in the medium. Some genetics simply need a little “push” to start flowering. If you’re using nutrients, go ahead and switch to blooming nutrients. If you have it on hand you can add some unsulfurered blackstrap molasses , dilute it in a warm glass of water before you add it to your feed. Doing either of these will give a “kick” to the plant ans trigger flowering. Hope this helps ! 🚀