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Danielle D. Treadwell, George J. Hochmuth, Robert C. Hochmuth, Eric H. Simonne, Lei L. Davis, Wanda L. Laughlin, Yuncong Li, Teresa Olczyk, Richard K. Sprenkel, and Lance S. Osborne

use in certified organic systems for greenhouse herb production. In addition, only Succop and Newman (2004) provided fertility recommendations for greenhouse-grown basil. With this exception, tissue nutrient content thresholds for the developmental

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Daniel F. Warnock and Charles E. Voigt

Greenhouse production of rosemary (Rosmarinus officinalis L.) as small potted Christmas tree topiaries for holiday sales has become necessary for many companies marketing to large retail outlets. Topiaries must be sheared multiple times to obtain an acceptable Christmas tree shape. Cultivars vary in physical attributes, suggesting that they may respond differentially to mechanical shearing during production. This study assessed sixteen rosemary cultivars for their potential as potted Christmas tree shaped topiaries. Beginning July 2001, rosemary plants derived from vegetative propagation of shoot tips were provided high fertility and maximum light in a greenhouse. From August to October, plants were pruned monthly for a total of three shearing events. The crop was considered mature on the targeted market date of 5 Dec. Final plant quality was visually assessed using a 1 to 5 scale that accounted for taper, plant-to-pot ratio, canopy density, foliage quality, and overall appeal, with one point being removed for each factor not meeting industry expectations. The cultivars varied in their performance as Christmas tree shaped topiaries with most being unacceptable due to minimal basal branching or excessive leaf burn that negatively impacted shape, taper, and aesthetics. Six of the cultivars, `Taylor's Blue', `Herb Cottage', `Joyce DeBaggio' (Golden Rain), `Shady Acres', `Rexford' (Rex), and an unnamed clone, were suitable for commercial use having visual ratings ranging from 3.8 to 4.5. These cultivars had equally healthy foliage with little damage. `Taylor's Blue', `Shady Acres', `Joyce DeBaggio' (Golden Rain), the unnamed clone, and `Herb Cottage' had foliar damage ratings ranging from 3.3 to 3.8 and were not significantly different from the most healthy cultivars, `Logee White' (Thinleaf White), `Salem', and `Hill Hardy', all of which had mean ratings of 4.0. These cultivars should be examined for additional attributes that may enhance their performance as Christmas tree shaped topiaries.

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Daniel F. Warnock

Greenhouse production of rosemary (Rosemarinus officinalis) as small potted Christmas-tree topiaries for holiday sales have become necessary for many companies marketing to large retail outlets. Topiaries must be sheared multiple times to obtain an acceptable Christmas-tree shape. Most production greenhouses use hand pruning shears or hand-held cordless grass shears to shape topiaries free hand or with the aid of a template. Crop size and uniformity can vary with these shearing methods. To create a more uniform rosemary Christmastree topiary for cultivar evaluations, a mechanical shearing device constructed from over-the-counter parts was developed at the University of Illinois. A detailed description of the design and construction of this mechanical shearing device is presented in this report.

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D.D. Treadwell, G.J. Hochmuth, R.C. Hochmuth, E.H. Simonne, S.A. Sargent, L.L. Davis, W.L. Laughlin, and A. Berry

, continue to collect herb production data. Producers are exploring soilless greenhouse herb production systems as a means to produce high-quality crops in an efficient manner. Benefits of protected agriculture include increased protection from crop pests

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Mary A. Rogers

.J. Hochmuth, R.C. Simonne, E.H. Davis, L.L. Laughlin, W.L. Li, Y. Olczyk, T. Sprenkel, R.K. Osborne, L.S. 2007 Nutrient management in organic greenhouse herb production: Where are we now? HortTechnology 17 461 466 Tyson, R.V. Treadwell, D.D. Simonne, E.H. 2011

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Guihong Bi, William B. Evans, James M. Spiers, and Anthony L. Witcher

.H. Davis, L.L. Laughlin, W.L. Li, Y. Olczyk, T. Sprenkel, R.K. Osborne, L.S. 2007 Nutrient management in organic greenhouse herb production: Where are we now? HortTechnology 17 461 466

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Yuqi Li and Neil S. Mattson

in organic greenhouse herb production: Where are we now? HortTechnology 17 461 466 Valenzuela, H.R. Hamasaki, R.T. Fukuda, S.K. 1994 Field cucumber production guidelines for Hawaii. 7 Apr. 2019. < https://www.ctahr.hawaii.edu/oc/freepubs/pdf/RES-151

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Courtney D. DeKalb, Brian A. Kahn, Bruce L. Dunn, Mark E. Payton, and Allen V. Barker

.4.461 Treadwell, D.D. Hochmuth, G.J. Hochmuth, R.C. Simonne, E.H. Davis, L.L. Laughlin, W.L. Li, Y. Olczyk, T. Sprenkel, R.K. Osborne, L.S. 2007 Nutrient management in organic greenhouse herb production: Where are we now? HortTechnology 17 461 466 10.2134/jeq2004

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Thomas A. Obreza and Jerry B. Sartain

.H. Davis, L.L. Laughlin, W.L. Li, Y. Olczyk, T. Sprenkel, R.K. Osborne, L.S. 2007 Nutrient management in organic greenhouse herb production: Where are we now? HortTechnology 17 461 466 10.21273/HORTTECH.17.4.461 Varshovi, A.A. Sartain, J.B. 1993 Growth, N

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Azeezahmed Shaik, Hardeep Singh, Sukhbir Singh, Thayne Montague, and Jacobo Sanchez

Treadwell, D.D. Hochmuth, G.J. Hochmuth, R.C. Simonne, E.H. Davis, L.L. Laughlin, W.L. Li, Y. Olczyk, T. Sprenkel, R.K. Osborne, L.S. 2007 Nutrient management in organic greenhouse herb production: Where are we now? HortTechnology 17 461