Author Archives: Brian E. Whipker

About Brian E. Whipker

Brian Whipker is a professor in the Department of Horticultural Science at North Carolina State University.

How PGRs Make You Money

How do you know when it is cost-effective to use plant growth regulators (PGRs)? Certainly they can be used to regulate plant growth and size, but that is just one part of the equation. Chemical costs are the primary concern to growers. There is certainly a variable cost associated with using plant growth regulators. The

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.

Preventing Plug Stunting

We have all heard the cliché doctors make the worst patients. Well, sometimes greenhouse growers make the worst horticulturists. We have learned over the years just how far we can push our plants. A case in point is plugs. They often arrive in large batches, usually when there are not enough folks to transplant them

Using The Plant Growth Regulator Calculator

Rounding out the GroCALC software package, PGRCALC is the third and final program that has been updated in the past few months. The calculator has been updated from a Microsoft Excel-based program to a Web-based application that does not require a user download. If you are currently using PGRCALC, you know how this tool can

Using The Alkalinity Calculator

Figure 1. The NHfloriculture.com home page. Click on "Grower Tools" to be directed to the GroCALC page. Click here for more screen caps from the AlkCALC tool. If you have tried to use the Greenhouse Media Lab Acid Addition Calculator, the alkalinity calculator from Purdue University and North Carolina State University in the last couple years, you