I have just planted some 'long cane' Tulameen mid-July fruiting raspberries. The general rule when planting raspberries is to cut down to 12" after planting. However, as these have come as 'long cane' already 5 ft high, does the general rule still apply. I cannot see that it would be sensible to cut them back to 12". The producers' write up says "They are shipped to customers as a 'long cane' which will produce fruit in the first year of planting" Any advice greatly appreciately. Thanks.