So the oxeye daisy is in flower.
And that's the one that's been used to check for lovers' interest through the ages.
The Germans have a nice little ditty on the topic. It goes:
Er liebt mich
über alle Massen
kann's gar nicht lassen
fast gar nicht
Translated, that means:
he loves me
more than everything
a teensy bit
not at all.
That's 6/8, if we count "a teensy bit" as a positive, too. Much better than the ½ chance you get with "loves me, loves me not".
So go find an oxeye daisy or a bellis and try it out for yourself. Who knows, he/she might even turn out to love you!