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My lavender bushes were deheaded after the last flowering but this time the new "flower heads" have formed but not flowered, they are just a greyish colour, no purple at all. Any ideas please. Dehead them or what?

Wendy said "be patient" Dot, they'll come!
At our age these things take time!

Can of spray paint from the hardware store?

The purple has drained to the roots.
You need to invert them for a few days. A bit of light on the rooting system will soon chase the colour back.
For prevention, a fewbulbs planted nearby will prevent futher occurence.....

Interesting, shall give it a try

errrr .... don't try the same trick with your rhubarb plant!!!

BruceS wrote:errrr .... don't try the same trick with your rhubarb plant!!!

No way she is precious

No good asking me Dot, I managed to kill about 5 mature lavender bushes at my last house

Probably too much water? They are a very hardy, drought resistant plant that thrives in sandy environment.
There are, of course, many varieties.
If ever you're looking for somewhere to visit of interest in the Bordertown, Wolseley, Teatrick area call in & see the Lavender Farm.
Old school mates of mine. Liz & Bruce Ballinger
http://www.teatricklavenderestate.com.au/

Some types do not tolerate hard pruning. Don't know much more than that but I found out the hard way.