Lucky Jack Apple*New Release* Lucky Jack apples measure 7 to 9 cm (2. 5 to 3") with distinctive green skin beautifully striped in a deep red. The Lucky Jack has an interesting quirk: quite tart until the end of September, the starches suddenly convert to sugars, transforming into a complex and flavourful sweet apple with crisp white flesh. Harvest is around mid late September, depending on the year. They're excellent for fresh eating, and could be decent for sauces,