I'd give it a 'haircut'. Since you see the new shoots breaking on the old stems below the dead parts, that's where the new stems will start. I usually trim mine plants to shape them, even if it means cutting back parts that have broken bud already. Do the same with the dianthus. You want to do it before there's too much new growth which would shock the plant.
The plant will grow either way, it's just to keep the shape and make it look better. Many plants need to be treated this way; roses, shrubs, perennials, etc.
You can do nothing, and it will grow just fine. Or you can trim it, if it is getting too big, out of shape, or you just hate the way it looks, and it will grow just fine.
Yes, you can leave it alone or trim it to make it look neater and possibly sprout new stems from the base. I have lavender envy; it doesn't like my acid clay soil, so we have to make special measures to grow it. You're actually doing very well!
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The plant will grow either way, it's just to keep the shape and make it look better. Many plants need to be treated this way; roses, shrubs, perennials, etc.
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...grapevines....
And holy moley, do I ever need to get my grapevines trimmed and trellised!
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and it came back up lusher than ever. ;)
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Lusher and more exuberant than ever and harder to train because I didn't start it off properly.
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