Queensland State Archives posted a photo:
Grow A Custard Apple Tree.
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How To Prune It.
The young fruit of the custard apples are making good progress now, and should reach the ripening stage in a couple of months. If planted in a part of the garden where plenty of water is available these trees will bear a prolific crop of fruit, and are an acquisition to any garden plot.
When planted out, the trees should be put back to a height of about 20 to 24 inches, and the two top buds which are on opposite sides of the stem be allowed to develop. The following spring these two branches should be cut back to not more than one foot in length, less if growth is weak, and each allowed to develop two buds, a young tree, having four main limbs, being thus formed.
These four branches are again cut back the following spring, only