Growing biennials late

in Plants
I've forgotten all about my biennial seeds for next year! Of course, I would normally sow them in May time for flowering the following year, but do you think I could get away with sowing them now, and when it begins to get a bit colder, bringing them inside to a warm bay window to make up for the lost time? I hope so, I will miss my hollyhocks!
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PS if you have hollyhocks already they will probably self seed, right?:) the seedlings are pretty distinctive