Posted: 09/04/2015 at 21:35
Well rotted horse manure would certainly be the best overall and you would normally spread that on flower beds and shrubs in early spring. Put it on veg. beds in the autumn. However, fish, blood and bone fertiliser is an excellent slow-release organic fertiliser which you just need to tickle-in to the surface with a small rake, hoe or similar andis usually added in spring.
If you have clay or sandy soil, then a top-dressing of well-rotted manure will improve the soil structure as worms will pull it down into the soil. If you are lucky enough to have a good loamy soil then F,B & B will be enough but adding manure is good for any type of soil.