The secret to giant tubers is hiding in your trash can.
The banana peels you throw away contain potassium, phosphorus and magnesium—what potatoes need to grow.
But the method only works if used correctly. Dry the peel on a radiator or in the oven (50°C, 2 hours), then grind into powder.

When planting, place 1 tablespoon of powder in each hole and sprinkle with soil to avoid attracting ants.
The peel decomposes within a month, releasing nutrients directly to the roots.
Result: the bushes become more powerful and the tubers become larger.
But there are nuances. Never use fresh peel - it causes rot and attracts fruit flies.
If your potatoes are growing in acidic soil, add a handful of ash to the peel to neutralize the pH.
If there is a threat of wireworms, soak the peel in garlic infusion (100 g per 1 liter of water) before drying - the smell will scare away the pest.
After sprouting, feed the potatoes with an infusion of the peel: pour 2 cups of powder with 10 liters of water, leave for 3 days. Water 0.5 liters per bush. The harvest will ripen 2 weeks earlier, and the storage quality of the tubers will improve.
But remember: the peel is not a substitute for full-fledged fertilizers. Combine it with humus and mineral fertilizers.
Store the powder in glass jars - it will become damp in plastic.
If the method seems dubious, try an experiment: plant two rows - with and without peel. The difference will surprise even skeptics.