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I think getting plugs to flower in 5 or 6 weeks is over optimistic, maybe the odd one but not a display.
But go and see what the GC has, maybe something a bit bigger than plugs and a bit further forward.
Getting near to the limit for plugs now I think if you want a good display this summer. Even stocks would be hard pressed to flower by June 7.
I would go to a local nursery and buy plants at least in 9 cm pots. Argyranthemums are available as decent size plants at the moment. Remove the buds and feed amd water well and by early June they will flower again. Lupins bought now will flower then too.