Natural Open-Pollinated Crosses Using Polycross Nurseries

There are three general approaches used in Jerusalem artichoke breeding (1) controlled crosses conducted under greenhouse conditions, (2) natural open-pollinated crosses using polycross nurseries, and (3) a variation of the latter where isolated pairs are allowed to cross in the field. Each method has its advantages and disadvantages. 

2 Natural Open-Pollinated Crosses Using Polycross Nurseries 

Polycross nurseries involve placing selected parent clones in an isolated area with the plants positioned in a manner that facilitates all possible combinations. Crossing is by way of natural pollinators, and while the female parent is known, the pollen source is not. The primary advantage of the technique is that it requires minimal time and labor. Large numbers of seed can be produced, 

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