Feeding bedding plants already too wet

I made my usual mistake of not using slow release feed when potting and planting my bedding plants. After a lovely dry spell we are now in a very wet one. I would love to feed them all as they are due but my feed is soluble stuff. Is there anything I can use instead that doesn't involve drowning them?l I have my granules which I use for roses and shrubs,would a little bit of this work? Please help.