Most of all, it's an olfactory memory: there's something Proustian about tomato feed, of hot greenhouse stuffiness and being small. It's one of the key smells of summer for me.
Flowers, and the fruit and seed that appear after, need energy to grow. That comes from the sun, of which there's more in these warmer months, but it also comes from nutrients in the ground. The key nutrients are nitrogen (chemical symbol N), phosphorus (P) and potassium (K).
But tomato feed is particularly high in potassium, which makes it as good for flowering plants as it is for tomatoes (also a flowering plant, but probably not the reason we grow them). There are different ways of making sure your plants get the nutrients they need and, as with most things in the garden, everyone will have their own take.
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