Thank you everyone for all your great advice. I’ll let you know how it all works out 
I over watered my lavender in pots and unwittingly killed it off. I now have loads growing in the garden in the clay soil there and its growing prolifically! Trial and error, I found!
Don’t over water.
I cheated and bought some little lavender plants and stuck them in a big planter, but they have gone wild and a bit straggly, growing well but monstrous, can you cut them back I guess after they have flowered? they haven’t flowered yet. 
(sunflower icon was all that’s available !!)
Yes, you can cut them back but not into the old wood
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As little ramstudio says cut only where there is not the old grey wood.
You know the flower stems the long bit that has leaves at the bottom and the flower at the top.
Well after it’s flowered cut those long stems down to where the tiny leaves are.
You can then dry the lavender heads for lavender bags 
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I’m no expert but I hack away basically everything except the woody parts (only because my secateurs won’t cut through it) every winter.
I’ve got one lavender plant out the front where it gets the morning sun. It’s been there about four years now. The soil is well draining. I just entirely neglect it and the rosemary which grow out there … except the winter haircut, and they both grow like crazy. Honestly … at this time of year the lavender is like something out of Day of the Triffids … I can see the flower buds growing right up to the kitchen window!
I wish more plants loved being neglected like that
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so it’s a severe hair cut at the beginning of winter then, I intend to dry out the flower heads, and it would be lovely to make some lavender sachets, if I get some time - it’s all go lately! I also have a rosemary plant and that could do with a trim to roast dinner maybe …yummy
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I have put mine in a pot with sandy soil and put them in the green house to give them a boost. They’re not dying anymore and have actually started growing some new leaves. Thank you everyone for all your advice
Donna x
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Hi Everyone, I just had to let you all know, I went out to water the plants and my lavender has flowers!! Thank you all for all the wonderful tips that got it growing
Donna x
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Yay! Mine is in frenzied flowering mode at the moment and making the local bee population very happy indeed. It must be all this sunshine.
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That’s great to hear Donna!
We bought 4 new lavenders yesterday, 2 are white ones with tufted heads, they look beautiful. Now just have to decide where to plant them
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