Let’s go back to the beginning. Pink Lady is a hybrid between the Golden Delicious and Lady Williams varieties. This hybrid apple from 1973 is actually the variety called Cripps Pink. It is named after John Cripps, who worked for the Western Australia Department of Agriculture. He crossed hundreds of apple varieties and grew the seeds until the more than 100,000 trees matured and had fruit of their own. After thousands of taste tests, the tree that became Cripps Pink was selected.
There isn’t an apple variety called Pink Lady. Pink Lady is a trademark name. There are at least six different apple varieties that can be sold under the Pink Lady trademark. They include Cripps Pink, Barnsby, Lady in Red, Maslin, Rosy Glow, and Ruby Pink. Mostly the differences between these apples are not likely to be noticed by consumers. Pink Lady trademarked apple varieties must meet certain standards of sugar content, firmness, blemishes, and color to be called Pink Lady apples.
About two-thirds of the Cripps Pink apples do not meet the Pink Lady standard and are sold as Cripps Pink apples for eating or making apple juice, applesauce, and other products.
John Cripps also crossed Red Delicious and Lady Williams apples to get the Cripps Red apple that is sold as the Sundowner apple. It is similar to the Pink Lady apple and can be substituted in baking and other recipes.
One of the reasons the seeds in your apple were sprouting is because of the long time it takes the fruit to mature on a Cripps Pink apple tree. Most common apple tree fruit mature in three or four months. Cripps Pink apples mature in seven months. This means that Cripps Pink apple trees will only produce apples in warm climates.
During the long maturation process, the chemicals that keep the seeds dormant in the apple core slowly dissolve away. If you are eating these apples in the spring and summer, they could be coming from growers in Australia or South Africa. If they are coming from U.S. orchards, they have been stored for many months in refrigerated warehouses, since they store well. The seeds have gone through a simulated winter dormancy and are ready to grow.
Plant the seeds in flower pots with potting soil. They will probably grow from a few inches to about a foot tall this summer. You can plant them outdoors in the fall, but the soil may dry out around the small root system. It will probably be better to place the pot in a large plastic bag and store it in the refrigerator until next spring. Planted outside in the spring, the trees will grow larger root systems. It will take three to five years of good care to get the plants large enough to produce an apple. You will only get apples if you live in warm climates that can get more than 200 days of growing season weather.
You will be growing Cripps Pink apple trees, and maybe you will like the apples enough to call them Pink Ladies, but you will need a license to grow and market them as Pink Lady apples.