PRODUCTION OF ULMUS PROCERA ‘VAN HOUTTEI’ BY CUTTINGS
The golden elm, Ulmus procera ‘Van Houttei’ is native to southern England and has been used in their landscape being a good contrast planted amongst other types of trees. An established tree is resistant to wind, drought and excessive moisture. This tree is a difficult subject to produce but is worthwhile as it is a popular garden plant. Up until 1971 we used to root-graft elms with an 80% success rate. They were grafted by the whip and tongue method onto roots of 2 year old Ulmus parviflora seedlings. They were tied with raffia and planted in situ in the field where it was important to bury the graft union below ground level to prevent dehydration. Plants were saleable in 1 to 2 years from grafting.
In 1971 trials were made producing them from softwood and hardwood cuttings. For softwood cuttings half-ripe tips and firmer stems were used dipped in various hormones. The results were: with 0.37% NAA, 60% rooting; 0.6% IBA, 70% rooting; a 50/50 mixture of 0.37% NAA and 0.8% IBA, 75% rooting;
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