I highly recommend callery pear for euro rootstocks if you want a 20 foot tree. BET are more of an Asian rootstock because they get huge unless your talking about a euro that dwarfs BET with early production like harrow delight. Asian ppears produce early which runts our BET rootstocks. Harbin are big rootstocks also and are to susceptible to decline for euro pears. Copenhaven Pear — CopenHaven Farms or williamette FRUIT TREE SEEDLINGS | Willamette Nurseries rootstock clonal seedling fruit tree ornamental seedlings will have all the types of rootstocks I mentioned on the site. They only sell large quantity. In Missouri you have more water so ohxf rootstocks are ok in some situations but standing water would not be great for those. I prefer wild callery from a wet location or BET for wet feet. Bet dont do as well as callery in water. I would go dig some up and use those they will work best. See this thread Wild callery pear rootstocks . In a pinch the widely available ohxf333 rootstocks seem more tolerant than other dwarfs but not my favorite. Callery is your overall best bet.
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