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American Society for Horticultural Science

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Hydrangea Cold-hardiness Tested Under Simulated Climate Warming Conditions

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Research shows hydrangea buds more sensitive to frost injury than stems

A study investigated cold-hardiness of stems and buds of Hydrangea macrophylla 'Alma' during dehardening in response to simulated warm spells and subsequent rehardening in January and early March. Results indicated that buds are more sensitive to frost injury than stems, and the vulnerability of stems to frost injuries (caused by an unstable temperature regime) changes during the winter season.

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Nitrogen's Effect on Apples Reported

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Study reports increasing N delays color development, speeds apple flesh breakdown

Researchers studied 'Gala' apples to determine how nitrogen supply affects flesh starch breakdown relative to skin color development. 'Gala' trees were provided with four levels of nitrogen (N) in a modified Hoagland's solution and the effects of N supply on yield, fruit quality, and fruit maturation were evaluated. Results indicated that increasing N supply delayed skin red color development but accelerated flesh starch degradation.

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Fertilizers, Irrigation Methods Prove Lucky for Shamrocks

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Best performing fertilizer combinations revealed for greenhouse shamrock production

Experiments with two varieties of shamrock plants investigated the effects of fertilizer concentration and irrigation methods. Overhead irrigation produced the best plants in terms of stature and root mass in Oxalis regnellii. Current fertilizer recommendations produced commercially acceptable plants, but larger, potentially more valuable plants were produced using several experimental fertilizer formulations. The study recommended that fertilizers containing little or no phosphorous (P) and those with excessive P should be both avoided in shamrock production.

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Ultimate Thousand-petals Lotus Blossoms Again

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"Most honorable" lotus survived Cultural Revolution

'Zhizun Qianban' is a newly named lotus cultivar discovered in southern China in 2009 and registered by the International Waterlily and Water Garden Society in 2010. 'Zhizun Qianban' is a large-sized lotus with a double pink flower composed of up to 1650 petals. It can be planted in ornamental ponds, containers, or potentially grown as a cut flower. Lotus growers and enthusiasts have suggested that 'Zhizun Qianban' is the most honorable thousand-petal lotus ever found.

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Zoysiagrass Varieties that Perform in Shade

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Study recommends top turfgrasses for low-input environments

A 3-year study compared the shade performance of 10 commercially available zoysiagrass cultivars maintained as a low-maintenance groundcover in heavy tree shade. Overall turfgrass quality was noticeably reduced by the heavily shaded environment; however, some cultivars attained acceptable levels during midsummer periods. The results suggested that Z. matrellas may be better adapted than Z. japonicas for heavily shaded environments where inputs are conserved.

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Study Finds Root Causes of pH Drop in Orchid Substrate

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Phalaenopsis roots thought to be “major contributor” to pH decline

A study investigated if substrate, fertilization, light, and plant roots could be the cause of pH decline in sphagnum moss substrate used in cultivating Phalaenopsis. Results showed that fertilization was not the primary cause of long-term pH decline, and that exposure to light had no effect on substrate pH. The study concluded that the roots of Phalaenopsis may be the major contributor to substrate pH decline during production.

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