Help Identifying Plant

in Plants
We are new to gardening so this is probably really obvious! Does anyone know the specific name of this plant? Looks like a variety of lavender family?
Any advice on how easy/difficult it is to grow? Looking for something that can quickly spread over border. Thanks


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https://www.telegraph.co.uk/gardening/how-to-grow/how-to-grow-russian-sage/
If your soil is very heavy you could add some compost and horticultural sand/grit to it to improve drainage and open it up a bit.
Over winter it's a patch of grey stems
As to filling borders quickly I have done that in the past with plants that turn out to be right thugs, they do fill the border fast but just keep on going and you spend more time trying to keep them within bounds.
You don't say how big an area you have so start a new thread asking for ideas as there are some very helpful people in the forum