'Ernie' (Grimo 89) is a heartnut (Juglans ailantifolia var. cordiformis) from the breeding work of Ernie Grimo at Grimo Nut Nursery, Niagara-on-the-Lake, Ontario. It is a hand cross of Campbell CW3 x 'Simcoe', one of the best of about 150 trees in the nursery's test plot. Medium-sized nuts crack out whole when cracked on the edges, with about 29% kernel. It sheds pollen before its female flowers are receptive (protandrous). Rated for zones 6 to 8.