Seckle is very small. They are tasty little fruits. If i was looking at buying the trees on your list i would buy both the harrows you selected and Shenendoah. They produce quickly. Seckle and harvest queen are good but may have a 5-8 year wait before they fruit. Shipova is an interspecific hybrid which is good but very susceptible to disease. Harrow sweet and harrow delight on callery will likely produce in 1-3 years. Shenendoah is larger than bartlett but the flavor is slightly off at time of picking. It is not perfect when it comes to disease which you should consider. As it sits the flavor becomes more bartlett like. Harrow sweet fruit is excellent and bartlett like. Harrow delight is very good and bartlett like. Harrows have excellent disease resistance the others are not in the same class of easy to grow pears. 25 Harrow pear varieties
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