Author Archives: Jonathan Frantz

About Jonathan Frantz

Jonathan M. Frantz is a research horticulturist at USDA's New England Plant, Soil and Water Laboratory in Orono, Maine. You can reach him at jonathan.frantz@ars.usda.gov.

Silicon In Floriculture Fertility Programs: Ready Research Results

Silicon (Si) is not considered an essential plant nutrient because most plant species can complete their lifecycle without it. Still, some plant species can benefit from supplemental silicon in a variety of ways. Reports on dozens of ornamental species, including gerberas, roses, asters, New Guinea impatiens, zinnias, sunflowers, poinsettias and orchids, have begun to illustrate

Energy-Efficient Annuals: Scheduling Bedding Plants

Examples of software interface panels of Virtual Grower. This program can be downloaded free at VirtualGrower.net and can be used to estimate greenhouse energy costs throughout the United States. Desirable scheduling of garden plants includes producing a marketable crop for a specific date with the least amount of inputs as possible. A large contribution to

Responses To Temperature & Light

Temperature and light are the two environmental factors that primarily influence production time and quality of both young and finish plants. Knowledge of how crops respond to changes in temperature and light can help growers predict crop timing in a variety of greenhouse environments. One of the questions we’ve been addressing is whether less energy is