I would suggest the difference in price is flowers. Expensive ones will probably flower this summer. Cheap ones will be tiny plants and won't flower until 2020.
If you see them in flower at least you are guaranteed getting the colour that you want.
Thank you thrifty gardeners, they have just what I want. What a good idea to see them In flower, I can make Plymouth without too much hassle. Kind regards to all. Val
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Expensive ones will probably flower this summer.
Cheap ones will be tiny plants and won't flower until 2020.
If you see them in flower at least you are guaranteed getting the colour that you want.