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Help please my garden is 90/0 planters of various sizes with perennials, shrubs and climbers. I am unsure the best fertiliser/plant food to use. I replace the top 2/3 inches of soil each year and use water retaining granules in them. 

For perennials, shrubs etc I think fish blood and bone is best with your annual  top dressing.  An occasional spray of seaweed extract helps too with trace minerals etc. won't go far wrong with this......producing good strong healthy growth without overdoing the nutrients.  

Good morning Verdun,

        Thank you for the help shall sort this out

David K

I agree with Verdun, except to say that unless the plants are showing some kinds of nutrient deficiency I wouldn't say that a seaweed extract spray would help.

My reasons are that most perennials etc have hard, virtually waterproof leaves and therefore wouldn't absorb the spray.....certainly liquid seaweed is an excellent (and expensive) plant food, but for potted perennials perhaps better watered in. 

Hi David K 

     Many thanks for all the advice.

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