An Example of Even Ripening-Red Ball Plum
The Red Ball Plum shown here approaches the ideal for market purposes, which require that the plum not only ripen evenly throughout its flesh, but that the individual fruits ripen simultaneously. With such a fruit, the entire crop may be gathered at once-a very obvious advantage to the shipper.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 6