cuttings of ‘Shamrock’ inkberry holly and ‘Henry's Garnet’ sweetspire (Spring Meadow Nursery, Grand Haven, MI) were planted into trade gal pots with drainage holes. Liners were ≈6 months old at planting. At planting, root balls were submersed in a solution
States, to saline irrigation water. Materials and methods High salt concentrations. Liners (2 inches) of small anise tree (propagated at Auburn University), sweetspire (Spring Meadow Nursery, Grand Haven, MI), and muhly grass (Magnolia Gardens Nursery
methods Ten native Florida taxa (beautyberry, fringe tree, inkberry, yaupon holly, virginia sweetspire, wax myrtle, chickasaw plum, saw palmetto, walter's viburnum, and coontie) and 10 nonnative taxa (golden dewdrop, cape jasmine, crape myrtle, japanese
’ sweetspire) in 11.4-L containers. Plants of I. virginica ‘Henry's Garnet’ were obtained from Greene Hill Nursery, Inc. (Lee County, Waverly, AL) in Mar. 2008. These plants were propagated from cuttings from existing nursery stock in 2007 and produced in
Itea virginica L. `Sprich' (virginia sweetspire), Salix alba L. (white willow), and S. gracilistyla var. melanostachys (Mak.) Miq. (black pussywillow) were treated with a 4 mg·L-1 suspension of two herbicides, isoxaben and oryzalin, a water control (water) or a nonsaturated control (control) for 9 days. Growth and photosynthetic responses were monitored before, during and after the 9-day treatment for a total of 51 days. Growth index of white willow and virginia sweetspire was only reduced by isoxaben treatment while both herbicides reduced the growth index for black pussywillow compared to control. Plant dry weights of the willows were not affected by day 9. Final dry weight was lower for both herbicide treatments for all taxa. The water treatment resulted in lower total dry weight than control only for virginia sweetspire. Isoxaben reduced photosystem II efficiency (Fv/Fm) and CO2 assimilation (A) following release from treatments of virginia sweetspire and black pussywillow. There were few differences in Fv/Fm and A for white willow. The response to oryzalin was similar to water for most parameters measured for virginia sweetspire and white willow. Growth was more strongly affected by oryzalin for black pussywillow than for other taxa but there were few differences in Fv/Fm or A between oryzalin and control for any of the taxa. Virginia sweetspire and white willow showed promise for use in phytoremediation of oryzalin but none of the taxa performed well under the levels of isoxaben used. Chemical names used: isoxaben (N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyly]-2,6-dimethoxybenzamide); oryzalin (4-(dipropylamino)-3,5-dinitrobenzenesulforamide).
Itea virginica (Virginia Sweetspire) is a woody landscape shrub that has recently gained much popularity in the landscape. Several cultivars of Itea have been selected for fall leaf color and plant habit. Visual identification of some of these cultivars is difficult and confusion exists in the trade. RAPDs (randomly amplified polymorphic DNA) were used to identify Itea virginica cultivars. A single 10-base primer was sufficient to separate the cultivar Saturnalia from the cultivar Henry's Garnet. Two dwarf cultivars of I. virginica, `Merlot' and `Sprinch' (= Little Henry), were separable from `Henry's Garnet' using a single 10-base primer. A primer that distinguishes between these two dwarf cultivars has not yet been found. The technique of RAPDs appears sufficiently sensitive and repeatable to resolve questions of identity that may exist among several cultivars of Itea.
The LSU Agricultural Center and Louisiana Nursery and Landscape Association initiated an ornamental plant promtion, marketing, and recommendation program in 1996. Called `Louisiana Select', this program is intended to actively promote outstanding ornamental plants to Louisiana's gardening consumers. In addition, it provides county agents and industry professionals information on plants that should be recommended. The selection committee consists of an extension horticulturist, two county agents, a landscape contractor, a wholesale greenhouse grower, a wholesale woody ornamental producer, and two representatives from retail garden centers. Plants are usually promoted in the spring and fall of each year. Plants previously named as Louisiana Select recipients include `New Orleans Red' (Red Ruffle) coleus, mayhaw, `Henry's Garnet' virginia sweetspire, `Homestead Purple' perennial verbena, `Telstar' dianthus, bald cypress, `New Gold' lantana, `Confetti' lantana, `Trailing Purple' lantana, `Dallas Red' lantana, `Silver Mound' lantana, `Lady in Red' salvia, `New Wonder' scaevola, `Goldsturm' rudbeckia, and `Foxy' fox-glove. A theme (“Fall is for Planting Native Trees”) has also been promoted. Point of purchase signs promoting the Louisiana Select program and individual plants are made available to garden centers. Significant sales increases ranging from 300% to 2500% have been reported for seelcted plants with annual bedding plants and perennial flowers enjoying the greater sales volume increases.
experience alternating periods of flooding and drying. Dylewski et al. (p. 461) evaluated three native woody landscape shrubs for tolerance to repeated short-term flooding events. Sweetspire, inkberry holly, and possumhaw all maintained growth and good
irrigation, while sweetspire was mostly intolerant. Weekly irrigation with non-saline water may be an effective management strategy to alleviate plant stress and prevent salt buildup in the root zone. Colorants Enhance Aesthetics of Dormant Zoysiagrass
Mexico Madrono 25 151 154 Lindstrom, J.T. Pelto, M.C. 2003 Micropropagation of Virginia sweetspire ( Itea virginica ‘Henry's Garnet’) J. Environ. Hort. 21 206 208 Linsmaier, E.M. Skoog