Lord Derby is a traditional large English cooking apple, ripening in the mid-season - early September. It remains a popular apple variety in English gardens, and is a good choice if you are looking for an apple tree for the garden as an alternative to Bramley which can be used in the period from September to November.
Lord Derby is quite easy to identify, on account of its large size, bright green colours and ribbed shape. The Victorian author Hogg rates it as an "excellent culinary apple". The flavour is nicely acidic if picked young, but milder if picked when fully ripe (at which point the skin develops a more yellow hue). Like many Victorian cooking apples, it has naturally good disease resistance.