Question
Can Ranunculus survive in oasis foam? Or do they prefer water only?

Answer

For a wedding?  If it is in the floral foam of a bouquet holder - it will last longer if you place the ranunculus between hardier flowers & stems.  This will allow the rannunculus stems to be "held" a little more upright.  Take a spray bottle and fill it with crowning glory ( located at Floral Supply Syndicate or your local florist )  This is a clear coating that seals in moisture.  I tell Bridesmaids to spritz a light coating on 10 minutes before pictures, after pictures, and before the walk down the aisle if there is a long wait after the pictures are done.  At my wedding, all I cared was that the bouquet lasted for the pictures and ceremony.  The reception was where I danced the night away - and I even forgot the bouquet!  I love weddings and I will gladly give out tips on how to make a lasting bouquet!  :-)  Have fun!