Lemon yellow sunflowers

I was given a packet of mixed sunflower seeds in May. And for some strange reason, only these pale yellow ones are blooming now. There are more plants, but none of them have flowers yet.

They are growing in a "temoprary" spot. I didn't have enough room for all of them at the time they went in the ground, so I put them in my veggie garden, inbetween onions, raspberries and rocket. Not so temporary a spot, as they are still there and blooming wonderfully.