Lobelia for wedding at end of May
At the end of May (4 weeks today!) our daughter is getting married and I have undertaken to provide baskets of lobelia for table flowers. I bought bedding plants some weeks ago, which are now planted up in pots (3 plants per 6-inch pot). They're sitting in a sheltered corner of the garden; the plants look healthy and some are showing signs of flower buds. They had a feed of liquid seaweed a couple of weeks ago when I potted them up, and I did a little pinching-out of tips.
My question is this: how likely is it that these will be in full flower in four weeks? I find myself worrying that they will flower too early and be over, or too late and not be ready in time. I could bring them indoors to hurry them on, but if they start to flower, should I cut off any blooms until a week or two before?
Of course there is a fall-back plan - if they're not right, I shall go to a GC and buy whatever plants look bright and healthy (and blue!). But I'd welcome any tips on how to get these lobelia to be at their best by the very end of May.