How can I make flowers/petals suspended in water?

I saw something like this on Pinterest. I belive they stuck the flower stems through small pieces of bubble wrap to keep them afloat and from being waterlogged.

www.pinterest.com has some fabulous ideas for floating flowers for weddings.

When is the wedding? Wha is your location so maybe research can be done for real lowers

Read up on "Surface Tension" of water. And , how by adding salt will make the water more dense. Expeiment away !

Lost of more videos. Click on the link.

https://www.youtube.com/watch?v=Tl_ZGreT6eI

Maybe you could ask a florist for advice

Perhaps you could talk to your florist and ask them for idea and suggestions

Having been a Florist I doubt that they would be willing to share their expertise or you could offer to pay for a consultation. However I will enlighten you on a few aspects of this design. petals will not suspend in water the will always float to the top . There are several ways to secure flower heads under water. you can measure the distance of say 3 to 4 rose heads and attach through the calyx with fishing line and weight the bottom together to keep them suspended at different levels inside the vase. You can also get willow branches and attach the flowers to the branches and fill the vases with water. you will need to tape the top on the vases to keep the whole mess from floating to the top you can then place some flowers on top of the tape grid to make it look good it's also a good Idea to use several inches of glass pebbles to help secure the stems

You mention that the silk flower colors bleed. You can spray both sides of silk flowers with a poly spray. Let dry well before putting into water. I do this to all my silk flowers and silk foliage before putting in arrangements. (Makes them much easier to clean with a feather duster.) But, the best part is that the spray of poly keeps the colors from bleeding when I occasionally dip the flowers in sudsy water and rinse. Also, polyurethane spray keeps sun from bleaching out the color in silk flowers/foliage. I also use poly spray on all my grapevine/floral wreaths to preserve them for years of use, even outdoors.

Fill your vessel to the brim with clean water. Cut the flowers very close to the knape of the bloom, leaving only a centimeter or less of stem. Then place them in the water to make sure they float and water doesn't just fill the petal cup and sink the bloom.

This might work for you:

https://www.hometalk.com/posts/decorate/rooms/upcycled-vase-with-pressed-and-preserved-flowers-43835503

Maybe suspend in an Aspic used for food or maybe glycerine?