These appear each year in loads of my patio pots but I don't remember ever seeing them flower.
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Will flower in a couple of years or less if you give more space in a larger pot or in ground if you keep them watered or in shade to get over transplanting.Some vars. are recommended for self seeding & are a quick way of filling spaces in beds.They are never too invasive here & I like the foliage & early flower & colour range & shape, of which there are lots as they breed so easily.Show us a photo later.
Lat/Lng: 51.5, 0.3
OS grid ref: TQ6291