A few weeks ago, I harvested some leaves and stems from the wasabi plants in our garden (not the farm). I also promised that the plants would grow back. Well, they certainly did do just that. Don't be trepidatious to harvest leaves and stems. The >30% rule doesn't apply. Go for it. Make a memorable meal. The plants will be fine. In fact, for ours, even post- harvest the plants sent out even more flowers (which make a great tea by the way). For those buying wasabi starts, there are about 6 offshoots in this barrel. These are planted a bit denser than I'd recommend.