Questionwhat flowers can be found growing on long grass?
Answer I am not sure if "long grass" is the local name of a grass grown in the British Isles. In the United States "pampas grass" (
Cortaderia selloana ) is referred to a 'long' (tall) grass. It bears a white or pink inflorescence depending upon the variety. There are many other wild and decorative "tall" grasses. You might find a more complete answer to your question on the internet.