A note about Wildflowers:

You have to be lazy.

No, seriously, be lazy. Most of them look like weeds until they bloom (see Corn Poppy). Thus, obviously, the only way you'll ever see them bloom is if you're lazy and refuse to pull them out until they bloom.

Also, some of them (see Scarlet Sage) come back from the same plant every year so you can't just pull out the dead plants--it requires that you cut them to the ground instead (actually I believe Wild Seed Farms suggest you just mow over them or use a weed whacker on them). Unfortunately for us, the area where the wildflowers are planted doesn't exactly have a lot of dirt holding all the root systems in place, so I have to go out and cut all the dead plants by hand.