^ Good question. Not sure.. but I think professional growers (at my whereabouts) 'do' mixed states of growth of the plants in the period between early spring and maybe early autumn. Oh, that's for the outside growth.. and the mixed stages ensure them they can harvest on a daily (?) basis throughout that period.
They also use greenhouses here but most probably it's not doable to grow strawberries year 'round. I think in Nov-, December, Jan- and February it's not possible to grow them here. Um, dunno..
Think, the strawberries one can buy in those winter months here are grown in Spain. In greenhouses.. and.. by quite a few Dutch growers (that moved there), btw.
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Um, going to buy a second wooden container for (soil and) plants tomorrow. I'm that enthusiastic about the first one (on photo there).