Fertiliser?

[beguilingeyes]

I'm a complete novice. We have inherited a beautiful garden and have planted some fruit trees/bushes and some flowers.
Is there some sort of all-purpose fertiliser that I can buy or do different plants have different needs.

If you re-cycle all your garden waste via a compost heap, you'll need very little, if any fertiliser. A top dressing once a year of blood, fish and bone should cover most things. Have you checked your soil's PH to see if a bit of lime would also help?

Your garden needs Nitrogen (N), Phosphorus (P) and Potassium (K). Fertilisers will have different ratio of NPK for different purposes eg tomato feed will be high in Potassium.
Look for a fertiliser that is described as something like 'all purpose' or 'universal' and you'll be fine. You can get more specialised when you are more confident. Baby steps!

I only use fertiliser for things in pots and some vegetables. Everything else gets a top dressing of compost twice a year. I make the fertiliser, either from seaweed or comfrey leaves. (There is one exception, but I doubt you're growing a lemon tree at the moment, so it doesn't matter!).
If you are buying it in, then liquid seaweed is as good as anything else. I try to avoid anything solid, because it creates dust and I already have a lung condition.
Making your own fertiliser is very satisfying, but be warned, the smell will knock you flat!

Synthetic fertilizer is not great for the environment so best to use sparingly if at all. Unless your soil is very thin and sandy, I would just do as others have suggested, compost plus blood fish and bone or well rotted manure.

I live in a wet, flood prone area so only feed in spring and midsummer. In autumn I mulch with just compost, as most plants don't need much in winter and to avoid fertiliser polluting waterways with excess nutrients from fertilisers and manures.