Most apples are not self-fertile and in order to produce the best fruit results, the second tree of a different variety should be planted to optimize pollination. An apple variety can be optimally pollinated by any other variety that has a similar bloom time: in the same column or in an adjacent column on the chart. Crabapples may also pollinate apples as long as their bloom times overlap.
APPLE POLLINATION CHART
|EARLY – MID
|MID – LATE
|Granny Smith (S)
Varieties marked with a (T) are triploid and therefore sterile. They must be pollinated by a variety that is not sterile and they can not pollinate another variety. When planting a sterile variety, it is best to plant a self-fertile variety for pollination. An (S) next to a variety indicates that it is partially self-fertile and will often produce some fruit on its own. The second variety of apples will enhance fruit production.