Reason for low sowing rate of wildflower meadow seed mixes

Q: Why is such a low sowing rate of 4 grams per sq. metre recommended for wildflower meadow seed mixtures?

A: A low sowing rate is used to encourage a somewhat patchy open grass sward in the short term. This helps to create receptive conditions necessary for the development of wildflower seedlings. Eventually the sward will thicken and close up.