That's gorgeous and just the same idea really. The ball is good because they come in different sizes and you can arrange your wires around the rim to cascade down the sides of the cake as well as have your heavier flowers in the centre to stabilise it. Your cake and flowers are lovely, so much talent on here. every time I did a cake related search on Google I was directed here so I figured I may as well join !
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If the flowers are light,say a small spray hydrangea or a little cluster of cherry blossom they should be fine and the styrofoam lets you push the wires firmly in, you could even hot glue it, no one is eating this baby?
If for example you were using a spray of roses on a stem and it was a little heavier you could attach the closest flower flush to the cake underneath with royal icing. Just make the arrangement balanced so the weight is evenly distributed.
I always attach a few of my unwired filler flowers firston top of each other slightly so you build up the dome shape. That way the wiring is kept to a minimum and a big statement peony or similar on top with R I.That would give support to anything you wire say small ivy leaves cascading down.
N.B I am a homebaker . I am a florist to trade and I hope I'm not overstepping myself here by posting advice to truly artistic people but i love all things floral, edible or not and I always do cakes for my girls this way. If I ever learn how to take pics and upload them I will.
Just had another idea, you can buy styrofoam wreath bases in 8" upwards size. it could be neat to decorate them and then just slip them over the tiers, they practically weigh nothing and if was delicate blossoms it might be good to have a few of them under your belt even just for displays on dummies at wedding fairs?