Wait till they start growing and cut them back to one to two vertical trunks going up.
Then when they get way above the fence you can let them branch out.
Do this by each year cutting back the branches closer to the ground slowly moving up as you go.
Soon you will have a canopy to walk under not a big bush.
Many of these bushes are really huge trees that have been turned into a bush anyway.
You can have an oleander tree not bush by doing this too.
Same with a pomegranate
Here are oleander trees that have been properly taken care of and trimmed.
Not the unsightly things with suckers.
