The photo you send is a native weed and you should pull it. The flower seeds that sprout will have leaves that will be more narrow (snaps) finely cut (cornflower) or wider (GGerber daisy). I am not sure what type of seed you planted that is called apple blossom. Don't be discouraged as growing flowers from seed is a skill that is learned the hard way - but once you see a blooming plant you nurtured from a tiny seed the work will be worth it. Keep growing, Marianne Binetti