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Download Late July 2015 - Louisiana Nursery and Landscape Association
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LSU AgCenter Ornamental Horticulture E-News & Trial Garden Notes Late July 2015 Nursery, Landscape & Garden Center Updates Compiled by Allen Owings, Professor (Horticulture), Hammond Research Station, LSU AgCenter Edited by Rick Bogren, Professor (Communications), LSU AgCenter Phone 985-543-4125; Email [email protected]; www.lsuagcenter.com/hammond Landscape News Articles (from Allen Owings and Rick Bogren) New Tree / Shrub Evaluations at Hammond – July 17 http://www.lsuagcenter.com/news_archive/2015/July/headline_news/New-trees-shrubsevaluated-at-Hammond-Research-Station-.htm Gomphrena – July 24 http://www.lsuagcenter.com/news_archive/2015/July/headline_news/Gomphrenaproduces-colorful-flowers-now-til-frost.htm Ornamental Plants of the Week – August 2015 (from Allen Owings and Rick Bogren) Switchgrass – August 3 An ornamental grass worthy of increased use in Louisiana is switchgrass (Panicum). This is a native, tall-growing perennial that is a great alternative to other ornamental grasses being used. The more common varieties reach heights of 5-6 feet in the landscape. They are very siteadaptable, being able to grow in several soil types. Plant in full to mostly sunny locations. They will tolerate wet soil. Plants begin growth in March with flower plumes appearing in summer and seed heads in late summer/early fall. Try the Northwind, Dallas Blues and Cloud Nine varieties. August 10 – Dwarf Princess Flower Princess flower is also called tibouchina. Athens Blue or dwarf tibouchina has purple flowers from late spring through fall. Plants reach 24-20 inches in the landscape by fall with an equal spread. Plants are not generally considered cold hardy but will return from the winter in the warmer regions of south Louisiana. Plants prefer full to partial sun in order to bloom best. These do not need a lot of fertilizer and are low water users in the landscape. Dwarf tibouchina is also a nice container option. Variegated Tapioca/Manihot – August 17 This tropical plant is at home in Louisiana. When planted earlier in the year, it can really put on a show in late summer, early fall. Many gardeners also add them in late summer to provide unique foliage color in a landscape bed or container into fall. Variegated tapioca has vivid chartreuse/yellow patterned leaves. It is a native of South America and prefers full to partial sun. Plants reach 4-5 feet tall by 4-5 feet wide by fall. Plants love the heat. Plant in a well-drained soil. Purple Flash Ornamental Pepper – August 24 A great ornamental pepper for fall is Purple Flash. Leaves are purplish black with splashes of white. Plants produce small fruit that are considered secondary to the foliage. Plants like full sun to part sun for best foliage color expression. Plants are smaller than other ornamental peppers – 12 to 15 inches tall. This is an annual that many garden centers offer in late summer and early fall. Plants prefer well-drained soil and do well in containers and in landscape beds. Ornamental peppers are very heat-tolerant and will last until first killing frost. Fruit is edible but very hot to the taste. Tecomas – August 31 Esperanzas, also known by their scientific name of Tecoma, come typically with yellow flowers, but apricot, oranges and reds are now becoming available. A common name for this plant is yellow bells. Esperanzas have been promoted as Texas Superstar plants. Bloom time is midsummer until first killing frost. The plant has a woody growth habit and is slightly taller than wide. Heights of 5-6 feet are common with widths of 4 feet. Plant in full sun. Plants love dry, hot weather. Mulch them well going into winter. They normally will return in following years in south Louisiana and portions of central Louisiana. Varieties include Bells of Fire, Gold Star, Orange Jubilee, Sierra Apricot, Lydia and more. Louisiana Super Plants 2016 Evolution Salvia farinacea (spring – early/mid-April) Serenita Raspberry angelonia (spring mid-/late April) Mrs. Schiller’s Delight dwarf Walter’s viburnum (late October/early November) Louisiana Super Plants – Listing of All Plants (2010-2015) LSU AgCenter Landscape Horticulture Industry Field Day and SELNA Trade Show – October 8th LSU AgCenter Plant Diagnostic Clinic LSU AgCenter Soil Testing and Plant Analysis Lab