Garden gaing balls are desinged to scare away birds and other pest.
to scare crows, and other birds, away from the garden
You put pink flamingoes in your yard because they scare away birds that might eat the seeds in your garden or they scare away birds from eating the grass seeds that you might've just planted.
There are no flowering plant seeds that birds will not try to eat if they get the chance. One needs to ensure the seeds are covered or there is something to scare the birds before they get near it.
Bark.
To effectively scare off blackbirds from your garden, you can try using visual deterrents like shiny objects or scarecrows, loud noises like wind chimes or a radio, or physical barriers like netting or fencing. It's important to consistently change up the scare tactics to prevent the birds from getting used to them.
Loud noises will get rid of most bird pests, but if you have neighbors, you could try trapping and relocating birds. Reduce items such as water and food sources that would attract birds. Balloons or reflective streamers can also scare birds away.
you
Scare birds
yes.
my balls
because they are much much bigger than birds
no it will scare the birds