Wallflowers-best way to grow on, until final planting position?

in Plants
I will have around 300 plants by the time I have completed transplanting the seedlings.
If I plant in to their final positions at the end of August, that is 4 months away. So, I am trying to decide what types of container etc will be best until then. Currently they are in 24 cell trays. Probably ok in them to the end of May, but then what?
Last year I used a quite a few 9cm pots-one plant per pot and they did not do too well in the pots.
I like to have the final planting area well turned over and prepared and pretty much clear of weeds. If I put them in the area too early there is a good chance for weeds to grow back amongst them.
Any ideas?
If I plant in to their final positions at the end of August, that is 4 months away. So, I am trying to decide what types of container etc will be best until then. Currently they are in 24 cell trays. Probably ok in them to the end of May, but then what?
Last year I used a quite a few 9cm pots-one plant per pot and they did not do too well in the pots.
I like to have the final planting area well turned over and prepared and pretty much clear of weeds. If I put them in the area too early there is a good chance for weeds to grow back amongst them.
Any ideas?
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I had the same issue last year, sowed a bit early considering they were to be potted up with tulips on October/November and they were way too pot bound with smaller square pots.
I will try to hold them back a bit. Keeping them in the back conservaltory which is cooler than most areas of the house. Gets very warm from 4pm to 7pm then cools down again.
No feeding them either