Purple Prince wasn't shown as a "tree lily" by Dutch Gardens, when I bought it in 2009. It did get to 6' but then the deer found it growing and kept eating the buds so I moved it (last fall) to a garden protected with deer fencing and it has bloomed beautifully. It's not purple to me - not like the "royal purple", but more a pink to magenta. This year it's around 3.5' tall but by next year should be back to 6' tall, though the label says the height is 3 - 4'.
