Hanging Basket advice

In the past I used slow release fertiliser, but I now mix in BFB when making up the compost, then after about six weeks I start giving a home made liquid feed, (comfry/banana, solution) at least once a week, but depending on how the plants look, this kep them going into October last year, as adding a layer of comfrey leaves, I don't know how that would do but if you don't try you will never know