Germplasm Evaluation Programs Research & Information Centers Germplasm evaluation blocks for research and education Almond Apricot Avocado Cherry Citrus Hazelnut (filbert) Peach, Clingstone Peach, Freestone Pear Pecan Persimmon Pistachio Plum Plumcot Pomegranate Prune Strawberry Walnut A ripe walnut, ready for harvest.