According to Osho, the realm of Nirvana is the nirvana without substratum—Patanjali’s nirbeej samadhi—where not only desire’s tree is cut but its seed is burned. Nothing remains to sprout again: no roots, no latent tendencies. One abides on the peak of no-mind permanently, with no relapse into samsara or suffering.
It's when you not only pull the weeds but burn the seeds, so nothing grows back and you don't fall into misery again.