Check its NPK ratios. If it's full of PK and for flowers it won't have enough nitrogen for leafy plants or, equally important, the PK part of the mix will be wasted on leafy plants.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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https://www.suttons.co.uk/garden-equipment/all/flower-power-premium-plant-food_mh5984
N-P-K 12-12-36
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.