Nhu, petiolatum never set any seed as it is supposed to be a natural hybrid. Crazy offsetting is at expense of the mother bulb mass and therfore of the flowers. Bulbs planted buried will flower regularly each spring and still produce a small number of offsets very year. Striatum is taller, less stocky and does produce seed and few offsets, good sized. They had never been confused in the past until someone decided petiolatum is a ssp. of striatum.