[JayG]

Binner will no doubt correct me if necessary when next on-line, but I believe he meant that growmore is a source of plants nutrients, whereas manure and compost improve the structure of the soil (and also provide some nutrients)

Nitrogen-rich fertlisers boost leafy plants (as in the grassland and cereal crops you have noted) but most vegetables need something more balanced.

Of the two you mention, growmore has an equal proportion of the 3 main essential nutrients (NPK) whereas Miracle Grow is relatively high in nitrogen.

Manure may be enough if your soil is relatively heavy and water-rententive already; light soils lose their nutrients quickly and in my experience need additional feeding.

[binner]

Binner will no doubt correct me if necessary when next on-line, but I believe he meant that growmore is a source of plants nutrients, whereas manure and compost improve the structure of the soil (and also provide some nutrients)

Nitrogen-rich fertlisers boost leafy plants (as in the grassland and cereal crops you have noted) but most vegetables need something more balanced.

Of the two you mention, growmore has an equal proportion of the 3 main essential nutrients (NPK) whereas Miracle Grow is relatively high in nitrogen.

Manure may be enough if your soil is relatively heavy and water-rententive already; light soils lose their nutrients quickly and in my experience need additional feeding.

exactly what i ment, you will benefit giving them some growmore this year atleast as some of the nutrients will be locked up in the clay, i found that the brassicas crops were not getting enough magnesium on freshly dug ground but on the bed that had been grown on last year and had had two lots of manure dug in, they were fine. the manure will help free them up in time, but then they will get quickly used up as you grow crops so a good sprinkle each year when you plant will do them the world of good,