May 31, 2022
Delmarva strawberry crop kicking into gear

In our region, commercial strawberries are grouped in two classes based on their flowering habit: those that flower and fruit mostly once in the spring and those that continue to flower and fruit as long as temperatures are moderate.

Strawberries thrive in cooler weather and production is affected when temperatures are hot.

June-bearing strawberries starting to runner in the heat. Photo: University of Delaware

Short day or June-bearing has been used to describe plants which start to bloom in late winter and produce one fruit crop per spring. Day-neutral, long day, or repeat blooming have all been used to describe plants which flower multiple times and produce multiple crops over the course of the spring, cooler parts of the summer and fall.

Most of our commercial strawberries planted on Delmarva are June-bearing types. They start initiating flower buds after planting in the fall and begin flowering in late winter and spring as temperatures warm up. Flowering will continue until critical high temperatures are reached. This critical temperature at which flowering slows or ceases varies with cultivar, but ranges are 80° to 86° Fahrenheit during the day and 75° to 78° Fahrenheit at night.

At these temperatures, runners form instead of flower-bearing branch crowns. The 90° Fahrenheit temperatures we had this past weekend will have effectively stopped flowering in June-bearing varieties. Day-neutral varieties may also have stopped flowering but will start flowering again when temperatures drop down below the critical values noted above. Day-neutral varieties are also induced to produce flowers as days get longer in June.

Gordon Johnson, University of Delaware Extension vegetable and fruit specialist




Current Issue

The buzz about the coming wave of cicadas

Powerful grapevine gene fights downy mildew

GLEXPO Bus Tour: Where farm marketers exchange ideas

BeeHero provides pollination solutions for real-time decisions

Q&A with Elina Niño: Honeybee health in 2024

Business: Why every operation needs two succession plans

Farm Market & Tourism: Develop a rewards program

Ag Labor Review: Supreme Court could provide regulation relief

 

see all current issue »

Be sure to check out our other specialty agriculture brands

produceprocessingsm Organic Grower