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Catlin elm ( Ulmus parvifolia var. Catlin)

a fast grower; takes heavy top pruning and pinching ; don't give extra iron or high Nitrogen fertilizer, especially not well into autumn: that could cause winter twig die-back; when leaf pruning, allow only the last 1/4" of the petiole to remain; a dead growing-season elm has dry green leaves, brown leaves are normal end-of-season alive; if in doubt about whether to water or not right now, don't water: large specimens are fairly forgiving; propagation from cuttings very successful; "Catlin" is the variety of choice; “Seiju” is hardier than “Hokkaido” but both of these very small-leaf varieties have brittle branches

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