As you can see from the picture here, the leaves and stalks look completely dead from the last frost.
If you are in North America, growing these is very, very, easy. Controlling these is very, very, difficult. This plant knows it is home and it will take over the whole garden if you let it. I know this is not an exaggeration as I have found patches of it growing wild in my area. Therefore, I took some extra precautions before planting these. I first started these in a planter. I then transferred them to an open bottom bucket I had once used for potatoes. I then built a large raised bed just for them. What started as one sunchoke in a planter is has now filled the raised bed with large tubers. Had I placed any other plants in this raised bed, they would have been “choked out” but the sunchokes. There is almost no more room for these tubers in the bed. Out of curiosity I raked my hand across the ground and one tuber popped up into my hand.
Harvesting these is not always that simple, but they are not hard to harvest either. I cut the stalks back and just pulled the plants up. The tubers popped right out with them. If some are a little stubborn to come up, a garden fork works great too. Just put the fork under the roots and pivot the handle down. The fork tines will lift the tubers up.