To be honest, I don't like these places in Japan where huge numbers of the same type of flower are planted as a tourist attraction. There's one at the end of my train line (Chichibu), where a very pleasant park (Hitsujiyama koen) turns into huge stripes of white and pink flowers for a few weeks in April, and to me it just looks weird, I prefer nature natural!
I've been to the area (Biei) where the photos on your site were taken, and I found the lavender fields the least attractive part of a very beautiful area.
A few from a little earlier. First is almost a flower within a flower, next is from a small bridge maybe 500-700m from home, and last is an ugly wall but the cicadas have been noisy these days and it's just the right moment:
are you a professional? Geez! Your pics are that astounding that i wish to download them all, print them out, and attach them on the wall in front of my bed, to make me feel relaxed. Can I?
Waiting for your "copyright" permission.