If you spread the seeds of Butterfly Garden, Bee Meadow, Wildflower Meadow and Co. on an existing lawn, there is unfortunately little chance that the flowers will actually germinate and grow.
Plants always need adequate space and nutrients to develop well. Grasses tend to grow a lot more dominantly than flowers, which is also one of the reasons why there are no grasses in our seed mixtures.
Therefore, on already existing lawns with densely distributed roots, flowers have very little chance to grow. We rather recommend sowing on unplanted garden or flower soil: For example, on a loosened strip of soil in the garden (this is perfect for a really colorful, insect-friendly flowering strip), directly in the flower bed or in a large flower pot. Also, please keep in mind that each mix consists of flower varieties that grow to an average height of 40cm (16in).
The result is more the growth of a wild meadow than of a "neat" flower lawn.