I struggle with understanding fertilisers .So I've been googling and
have found this
a light scattering of dried poultry manure pellets or the gruesomely named blood, fish and bonemeal will suffice.
Roughly a tablespoonful per square metre works well enough for me, but there is no need for pinpoint accuracy.
Results of my research are -chicken pellets or dried fish ,blood and bonemeal . ( any B&Q or similar sell this stuff in tubs and boxes ) About a tablespoon per square metre .And don't over feed as the plants get tall and floppy .
The three main nutrients are needed by plants for different reasons. Nitrogen promotes leaf growth, phosphorous is for the roots and potassium is needed for flower and fruits.
The amount of each is written on fertiliser packets as a ratio, for instance 6:4:6. Note that the order of nutrients is always the same, ie N, P, K. If the ratios are about the same, it is a general-purpose fertiliser and will aid all round growth
and
Gardeners often assume that poor growth in garden plants is related to lack of soil nutrients and give fertiliser. In fact, results from the RHS Soil Analysis Service show that shortages of plant nutrients in the soil are quite rare. Usually poor growth is due to other environmental factors such as drought, waterlogging and weather damage. Pests and dieases are also responsible for plants making poor growth.
Soils vary in their nutrient levels. Sandy soils and chalky soils tend to be lower in nutrients than clay or loam soils. Soils also vary in the availability of nutrients. Soils that are dry, waterlogged, very acid or very alkaline may not allow plants to access existing nutrients. Correcting these factors (where possible) may be more effective than giving fertiliser, and in fact may be necessary for fertilisers to be effective.
So mulching with chip bark after it's rained and the soil is damp is prob good .
But I am a novice so hopefully others will correct if my advice is wrong .
PS I asked about fertilising/feeding bulbs and rose fertiliser ,which is not an all round fertiliser ,more specialist ,was recommended .