I would only take the red onions out :)
Other than that it is an incredibly colorful and delicious combination.
I have never tried valerian, though, at least not in salads. I might have taken some drops once to calm myself down. It must be good for children, especailly after eating such a sweet fruit as watermelon :)
Ok, onions out, no problem!It will be still a refreshing and delicious salad!Whenever you have time, you should try to make it.
Valerian, as an addition in this watrmelon salad ,suits,is so healthy and also tastes good! Yes, it's soo good for children as well!
(Sorry for the late reply)