To feed or not to feed seedlings

my cold frame is now full of autumn sown hardy annual potted on flower seedlings. I've been feeding them with a v v diluted plant food every week. Should l stop now and just water them occasionally as needed over winter time. Any advice welcome.
Life's tragedy is that we get old too soon and wise too late.
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Cheers guys, just hope they survive till spring. I've certainly enjoyed the process so far.?