Any of them should do well as long as you have good drainage. It comes down to personal taste. Purple Sensation are one of the most widely grown. Sphaerocephalon are one of the most popular with the bees in our garden. There are also some nice white varieties that would look good mixed with the purple ones.
If budget is not a problem, Warmenhoven are the most renowned of the allium growers. Although they are based in the Netherlands, I believe they do mail order.
The biggest drawback of potted alliums is the foliage. It often look quite tatty by the time they open up. If you can position them where other plants hides it a bit, that helps, or you can use some other plants round the edge to disguise it. If it's for a statement pot, the latter is better. I'd agree with @KeenOnGreen - most of them are fine in pots, so it's personal preference. The taller varieties will need support unless they're in a very sheltered position.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Oh yes @Fairygirl I had forgotten how awful the foliage looks after flowering. @Acuwell Maybe you could grow them in the ground, and put something that has more attractive foliage in the pot? We grow Eucomis Sparkling Burgundy in pots, as well as in the ground. It has spectacular foliage colour, and the flowers are equally wonderful. It's not hardy everywhere, but you could always move the pot to a sheltered spot in Winter.
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If budget is not a problem, Warmenhoven are the most renowned of the allium growers. Although they are based in the Netherlands, I believe they do mail order.
If it's for a statement pot, the latter is better.
I'd agree with @KeenOnGreen - most of them are fine in pots, so it's personal preference. The taller varieties will need support unless they're in a very sheltered position.
I live in west central Scotland - not where that photo is...
Maybe you could grow them in the ground, and put something that has more attractive foliage in the pot? We grow Eucomis Sparkling Burgundy in pots, as well as in the ground. It has spectacular foliage colour, and the flowers are equally wonderful. It's not hardy everywhere, but you could always move the pot to a sheltered spot in Winter.