Speaking of fern leaf prices, Klehm's has a P.tenuifolia 'Rubra Plena', a double red, for $60. There are variations in naming the double red, some use 'Rubra Plena', 'Flore Plena' or 'Rubra Flore Plena'. Klehm's are listed as 14" high which matches my heirloom doubles but some of the double reds say 20" or more. Not enough to worry about unless one has plans to sell them.