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. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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.