PI553307 "Amethyst" is a purple raspberry plant originating in Iowa in the 1950's. I received two cuttings 9/8/14. They were dipped in rooting gel and placed in a bucket indoors due to dropping temperatures outside.
This variety never grew. The stems turned brown. Never set roots. Soil was kept moist and container was in a location offering indirect sunlight with an artificial grow light nearby (not directly on it).