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Rainier Cherries Begin in California. The first Rainier cherries of the season will beginning showing up from California in late May to early June. There isnât a huge supply of them and often the price is super high. They are only available briefly, then you may not see them in stores for a couple weeks untilâ¦.
1 For sweet cherries, make sure the different varieties will pollinate each other. 2  Plant sweet cherries in late fall or early winter if grown outside, or at any time if container grown. 3  When planting fan-trained trees, construct the necessary supports before planting.  Space fanned trees 15 to 18 feet apart.