I'm not really fond of Nanakusa-gayu (rice porridge with seven different kinds of spring herbs) but I cook it on every 7th January. This year I cooked with genmai (brown rice) and I like that the rice don't get too sticky. The seven herbs pack I bought this year contained too much Chickweed, just a tiny bit of Shepherd's purse, cudweed and Nipplewort. are these hard to grow?