We are planning on burning under the longleaf pine in January. Longleaf are fire dependent. My pictures show the longleaf pine planted in 2012. You can see that the brush and grass is getting high, but the pines are getting up there too. The longleaf is a very rich ecosystem because it combines grass and forbs with trees, all moderated by fire.
My pines have grown remarkably. You can see the pines today. They are many sizes but the smallest are about my height. The first picture of me with the pine tree was taken on April 18, 2015. That was the biggest one at that time. The other one was taken last month. Note that the pine changes but I stay the same.