Marviin, lowlanders are harder for most people for some reason. I think it is hard to get the temperatures high enough and keep the humidity up. In the summer I have no problem, I put them outside in my greenhouse, but they suffer during the winter. I bring them inside and put them in a small 4-tier greenhouse inside my house, but still the temps are not high enough or something. Intermediates and Highlands do very well for me.