Geranium, Hardy Geranium, Meadow Cranesbill 'Purple Ghost'

Planted in May 2016, part sun; punchased in Oregon. On 8.31.17 moved to a pot I can protect over the winter under the eaves to keep an e...Read Moreye on. Foliage is gorgeous--almost a black burgundy. Plant is virtually unchanged from 16 months ago when I planted it. Tag says it may be 16" high but it remains 4" high. Am wondering if anyone can tell me the water needs or how to get it established? My understanding was it will eventually be a ground cover, as with many other cranesbills. Next year will try full sun and more water, deeper mulch. Maybe I need to plant a dozen close together? Thanks.

New World Plants calls this the white-flowered counterpart to G. 'Nodbeauty' AKA "Black Beauty".

Due for release in 2015.