A beautiful plant, and of course the rhizomes are edible. Great for Indian curries, digestion and assorted aches and pains. Like all herbaceous perennials clumps of turmeric need to be broken up and fresh pieces planted every 3 to 4 years. Rhizomes are harvested 9 to 10 months after planting, the lower leaves turning yellow or stems drying and falling over are indications of maturity. It is possible for the home gardener to just dig carefully at the side of a clump and remove rhizomes as needed rather than harvesting the whole clump. Charles recommends growing in pots to avoid ending up with a turmeric forest. If you do put it in the ground, however, and leave it undisturbed for a year, it produces tall, very beautiful, white flower spike. The flower is so attractive that it is worth growing for this alone