Lachenalia in the ground?

I received a gift of Lachenalia 'Rupert' and Lachenalia 'Ronina' bulbs. I've only grown Lachenalias in pots in the past but I am wondering if I can grow these in the ground. I have sandy soil and a climate that usually doesn't go below about 25 degrees but this year got down into the upper teens (a real disaster). I expect next year won't be as cold. 

Shall I try these guys in the ground?  And if so, under what conditions?

Thanks
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