Hobbies / Books   (Gardening, walking, books, films, theatre etc.)

Comfrey (aka Knitbone) takes some beating when it comes to tomato feed. Usually, it is for free: grow it yourself.

Old-time gardening books oft have recipe for a comfrey 'tea', but it really stinks, and is hard work. Just a mulch of comfrey leaves and broken up stem around the plant, and LIGHTLY incorporated (id est dug-in) seems to work quite adequately.

Apply when tom's buds begin to form (when plant's need is for potassium), and happily this is also the time when your comfrey will be mature for cutting.

ps I have used banana peel around plants for decades with no problems. I would not use whole banana, or for that matter the fruit . Too much fructose (sugar), it will attract ants and other pests, which may well be a vector for fungal decay/rot.