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N. minuta will not survive in zone 7 outside they are tropical. Helvola is hardy so it will winter in your pond in zone 7. My pygmea overwintered in a 15 in pond depth in zone 6 with 3 days at minus 13*F.
That's weird. I have lots of N. pygmaea, they're just not up yet. I hate to pick my blooms before they're ready, but if I do get plants I'd be glad to send you one.