Author Archives: Roberto G. Lopez

About Roberto G. Lopez

Roberto G. Lopez is an assistant professor and floriculture extension specialist in the Department of Horticulture and Landscape Architecture at Purdue University. Roberto is a member of the Floriculture Sustainability Research Coalition. You can eMail him at rglopez@purdue.edu.

Using Parboiled Rice Hulls in Propagation Substrates

It is fairly common for substrates used in cutting propagation to be comprised of sphagnum peat moss and perlite or other materials. While there is no doubting the usefulness and effectiveness of peat and perlite as substrate components, some growers are looking for alternatives. Propagation substrates do have particular requirements compared to mixes used for

Reduce Flowering Time

This is the second article in a two-part series looking at the effects of light during cutting propagation. While the first article focused on the effects of daily light integral (DLI) during propagation of rooted cuttings, this article will focus on finished plants. We wanted to see how DLI during propagation affected growth and flowering

Produce High-Quality Rooted Cuttings

Whether you are a propagation specialist or are rooting cuttings for your own in-house production, the goals of propagators are the same — to efficiently produce high-quality rooted cuttings. In order to meet the spring and early summer market dates for flowering bedding plants, cuttings are typically rooted in mid- to late-winter and early spring

When Fertilizing, Don’t Neglect The Root Zone

Bedding and potted plants are traditionally fertilized daily or several times a week with water soluble fertilizer (WSF) applied in the irrigation water. With WSF, the fertilizer components are in a form that can be directly absorbed by the plant. This also means the fertilizer components can immediately impact the soluble salts and the pH

Bedding Plants and CRFs

While controlled-release fertilizers (CRFs) are not a recent addition to a grower’s toolbox, they are not nearly as common as traditional water-soluble fertilizers (WSF). Many growers comment that they don’t want to lose the control they have with traditional WSF programs. However, new formulations and technologies in CRF manufacturing, along with a desire for alternative

Potted Plants On CRFs

After seeing how bedding plants are affected by controlled-release fertilizers, three separate studies were conducted to show how the use of these fertilizers influenced the production of potted plants. The Poinsettia Experiments Rooted liners of ‘Premium Red’ poinsettias were potted into 4.5-inch containers filled with a commercial soilless substrate that was amended with CRFs: Osmocote

Grow Better Plants With Horizontal Airflow Fans

Horizontal airflow (HAF) fans are used to mix warm air near the roof of the greenhouse with the cooler air at ground level, providing a more uniform growing environment Often referred to as mixing or circulation fans, HAF fans are not the same as ventilation fans and should not be run at the same time.

Do High Tunnels Make The Cut?

Increased consumer interest in farmers’ markets, buying local and sustainability make this an opportune time for domestic specialty cut flower growers. Local market advantages of specialty cut flowers exist, including product freshness, quality and availability of stems that do not ship well or are difficult to find. Currently, an estimated 73 percent of cut flowers

High Tunnels: Grow Better Bedding Plants In Cold Weather

Bedding production begins in mid- to late-winter and early spring in the northern half of the U.S., when outdoor air temperatures and light are at seasonally low levels. During this time, greenhouses must be heated to maintain desirable production temperatures. The costs involved can be huge. Energy for heating in northern climates accounts for 10

Height Control For Easter Lilies

Flurprimidol drenches have been shown to successfully control height of oriental lilies and Dutch bulbs such as hyacinth, narcissus and tulips, but there is no data that shows how effective flurprimidol drenches are on Easter lilies. Researchers decided to find out.