I have just been looking at my Lavender Hidcote seeds, they take a very long time to germinate, I have several coming through, the first lot to germinate have several pairs of leaves, while others are just coming through. I did give them some bottom heat to start with, but now that the weather has improved! they are growing, in a shaded greenhouse. Please give it time, I was about to dump mine, when I noticed that there was signs of growth. Good luck.