A Cannabis Retailer’s Guide to Reducing Shrink and Inventory Variances - Get the Free Guide Now
A Cannabis Retailer’s Guide to Reducing Shrink and Inventory Variances - Get the Free Guide Now
Brian E. Whipker | Cannabis Business Times
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Brian E. Whipker

Dr. Brian E. Whipker, Ph.D., is a professor of floriculture at North Carolina State University specializing in plant nutrition, plant growth regulators and diagnostics. He co-authored eight scientific journal articles on the impact of fertilization with greenhouse species and three disorder diagnostic guides. Dr. Whipker has more than 30 years of greenhouse experience working with growers.

From Brian E. Whipker
Top Stories
Is Your Propagation-to-Post-Prop Fertility Transition Stalling Your Cannabis Crops?
A smooth handoff from propagation to finishing environment is key to preventing sudden nutrient swings that slow root growth and hinder vigorous plant establishment.
August 2, 2026
Two cannabis plants showing yellowing leaves with text 'Cultivation Matters' and Cannabis Business Times branding
Cultivation Matters
Are You Watering Your Cannabis Plants Too Much? Too Little?
Finding the ‘just right’ Goldilocks zone of substrate moisture can mean the difference between a record-breaking harvest and a catastrophic crop failure.
June 1, 2026
Cannabis plant root systems comparison showing developed roots in soil with 'Cultivation Matters' text overlay
Cultivation Matters
The Dangers of Calcium Deficiency in Cannabis Crops
When environmental conditions reduce transpiration, Ca delivery to young tissues can be restricted, even when sufficient Ca fertility is available, leading to structural (and financial) instability.
April 1, 2026
Cannabis plant with 'Cultivation Matters' text and Cannabis Business Times branding on dark background
Cultivation Matters
Testing Your Cannabis Substrate Is 1st Step to Success
Preplant substrate sampling can help cannabis growers proactively identify and correct potential issues rather than react to problems after they arise.
November 26, 2025
Young cannabis seedling sprouting in dark soil with 'Cultivation Matters' text
Cultivation Matters
Steel Your Cannabis Crops Against Iron Deficiency
Iron deficiencies in cannabis crops can be caused by many triggers.
September 26, 2025
Close-up of vibrant green cannabis plant leaves with 'Cultivation Matters' text
Cultivation Matters
Feel the (Cannabis Leaf Margin) Burn
Leaf margin burn can mean a variety of things when presenting in cannabis plants. Here’s what you need to know.
July 14, 2025
Cannabis leaf with text 'Cultivation Matters' on dark textured background
Cultivation Matters
The Right Spot: Understanding Nutrient Mobility in Cannabis Plants
When identifying nutrient deficiencies, remember: location, location, location.
May 5, 2025
Cannabis leaf with yellow and green coloration indicating potential nutrient issues
Top Stories
Balancing Root Zone pH in Cannabis Cultivation
Understanding how water quality, substrates and fertilizers impact substrate pH is crucial to crop health.
March 17, 2025
Cultivation Matters Top Story Image March 2025
Top Stories
3 Questions to Ask When Diagnosing Cannabis Plant Health Issues
Knowing the pattern, distribution, and timeline of a problem can guide you to the proper solution.
December 30, 2024
Cultivation Matters Jan 2025 Top Story Image
Columns
Teasing Out Mimics: Potassium vs. Magnesium
An NCSU study on optimal potassium and magnesium fertility for Cannabis sativa explored how various rates impact growth in the vegetative and flowering stages and the unique indicators of both nutrients to help with diagnostics.
October 1, 2024
LEFT: This six-week-old Cannabis sativa ‘BaOx’ plant received 0.0 ppm K fertility. RIGHT: Magnesium deficiency symptoms in their early stages.
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