Answer: Typically, variegated shell ginger grows to about 6 ft tall, which is not as large as the non-variegated species (Alpinia zerumbet), which can grow to as much as 12 ft tall.
There is a dwarf cultivar, Alpinia zerumbet 'Variegata Dwarf', which grows only to about 1 ft tall, but has the same green and yellow variegated foliage with white seashell flowers. There also is a cultivar, 'Variegata Chinese Beauty', which has light green and dark green marbled foliage, that grows to 8 ft tall.
Moles are difficult to control. The best control measure is to set traps in the active tunnels, replacing as often as necessary to control the entire population.
Best wishes with your landscape!
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