Yes. They only need protection from wet and wind. They're hardy.
If they've been properly hardened off, your soil conditions are good, and they aren't going to be exposed to harsh winds and rain, they should be fine. If you haven't been nipping them out at the top to get them bushier, you may find it's best to do that first though. Leggy, soft growth will be more vulnerable to weather conditions.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Unfortunately wet and windy here now, but the shops always sell them in March dont they, I get my seeds from Roger Parsons, and have got his book, he says grow them mean, no mollycodling,.
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If they've been properly hardened off, your soil conditions are good, and they aren't going to be exposed to harsh winds and rain, they should be fine.
If you haven't been nipping them out at the top to get them bushier, you may find it's best to do that first though. Leggy, soft growth will be more vulnerable to weather conditions.
I live in west central Scotland - not where that photo is...