You are buying 2 small plant divisions from my White Butterfly Ginger (Hedychium coronarium). These divisions are currently growing in quart containers, are well rooted (some have small rhizomes but mostly just roots on these plants) and range from 10" - 12" tall.
The white butterfly ginger have pure white blooms that appear on the top of 5'-6' tall, thick green stems in mid to late summer. These have the MOST HEAVENLY fragrance you can imagine - one of my very favorite gingers! Excellent for a night garden or near a patio or deck so you can enjoy them in the cool summer evenings.
These are hardy to zone 8a (although I have seen some reports of hardiness into zone 7, I cannot confirm that for certain). These can be container grown in colder zones.
They like full to mostly shade and are happy in about any soil - the further south you live, the more shade they will require. Some sites say to keep them consistently moist, but mine are in a fairly dry area and doing fine; if you have them in more sun, they will require more moisture to thrive.
Overall, I've found the butterfly ginger to be a carefree plant that multiplies quickly and it's fragrant blooms (think Jasmine or Gardenia) make it a 'must have' in any ginger collection or night garden.