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a. Apple interstem trees are composed of either MM. 106 or MM. 111 roots, a 6- to 8-inch stempiece of M. 9 or M. 27, and the scion variety on top. Pear interstem trees are composed of Quince root, a 6- to 8-inch piece of Old Home trunk, plus the desired scion. b. Malling Merton trees require extremely well-drained soils to perform as advertised. Do not plant them where drainage is slow or the soil is heavy clay.
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