I think nigroviolacea is a variation of tigrina. I bought one from Santa Barbara orchid estate 2 years ago, and it actually grows pretty well in my garden outside.
Mine tends to flower in late/spring early summer and then grow in fall/winter. The growths happen suddenly and mature in about 2 months. Min temp in my garden in winter months is around 50. A few nights may drop to the upper 40s but rare. My Stanhopea seems to do ok with this and I continue to water albeit a little less in the winter. (May be once a week.) Our day time temp always bounces back to lower 70s even in the middle of winter.
I don't know where you are, but I doubt Stanhopea can withstand a freeze. However cool temps are ok, and I continue to water, and usually in the morning. Also, my plant is in a wire basket, so water flows freely through.
This is my tigrina in flower in my garden back in May.
Andrew
Hybrid Mode
