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I'm wanting to grow some of the hardier types like the ones you mention above
The first spikes have appeared on my plants. Last year it was assumed they, O. lacteal, flowered early due to change in climate from Greece to N Ireland but they have had a year to change to our climate. They are a week later than they were last year
These aren't necessarily hardier. They require frost free conditions. Others more experienced may want to comment. Last year I didn't have the warming cables on at all and never covered them with fleece. In 2012 the warming cables were set to +5 and at night when frost was due I covered mine with two layers of fleece. Someone has a 'lid' of sorts that goes over his plants when frost is due