Blueberries: Blueberries (or as we northern Europeans call them, American blueberries) are planted once and yield a sizable, easily harvestable, 0-maintenance crop each year. We have 12 bushes in a 4x4-meter corner of our garden. At their peak season, they yield almost a litre of berries each day for a week.

Raspberries: My grandad used to have a vast number of raspberry bushes mindfully nurtured to give unfathomable harvests each year, but they are a bit more maintenance. He had 20 or more bushes, if I recall.

Strawberries: Strawberries are a massive pain. They are difficult to weed and need to be replanted with the seedlings each second year for an optimal crop.

Plums: Fun on paper... But it can be too productive to the point of absurdity. 20 plums... tasty. 20 buckets of plums and mushy sugar water in the whole yard? Less fun.

Cherries: Banger pie and jam... but I think 20 pies is a tad excessive. We mabie pluck 5% of the yield each year; the rest is left to birds to and replant in our neighbour's bushes.