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You cannot spilt a woody shrub-what you could do is take cuttings and grow them on
But you need suitable cutting material
Is this one of the shrubby hypericums? What I know as Rose of Sharon spreads itself without help from you or me. If it's shrubby and has two or more stems from below ground level you may be able to split it. Hard to tell without looking at it. If you do split it try and keep a good lump of root untouched so you'll at least still have the original if a split off piece doesn't survive.
I have 2 hypericons and I cut them back quite ruthlessly whenever they are getting a bit bossy
There's the ground cover invasive one, the shrubby ones like 'Hidcote', the seed everywhere type, (Hypericum androsomething or other). Which one have you got?
There is also a Hibiscus that is called a Rose of Sharon
Oh that-had one of those and dug it out last year-trust me you cannot split it-it was a real bugger to get out of the ground
You can hack it back hard though-it will come back-again -trust me
Do it now-well when it is nice to be outside-it will still flower this year
Are you sure it's Hypericum calycinum Tracy? This is an invasive ground cover plant (see what sotongeoff sas a few posts ago). I wouldn't describe that as a large shrub. It's large in the way it spreads but 18 inches would be as tall as it goes, often less.
There are some, eg a cultivar called Hidcote that go to about a metre and a half. These are a lot more refined, garden worthy and often seen in GCs
Oh Tracey-I can see you sitting there scratching your head all confused about what to do?
-is it possible to get to a PC to post a picture?