Skip Navigation Links Extension / Directory / Profile

Angela O'Callaghan

Social Horticulture Specialist

Office: (702) 222-3130
Fax: (702) 222-3100
Email: ocallaghana@unr.edu
Address: 8050 Paradise Road, Suite 100, Las Vegas, Nevada 89123-1904
Representing: Clark County - Las Vegas, Nevada
Download Electronic Business Card OR vCard

Summary

Angela O'Callaghan's areas of expertise are in horticulture, plant science and desert gardening. Her programs focus on school gardening and the Gardening in Small Places series, designed for those who want good horticulture information.

Programs
Publications

Programs

Healing gardens in Las Vegas

Extension healing gardens essentially become outdoor sanctuaries for people who are hospitalized as well as their families and the staff that works with them.

Master Gardener taking grape inspection notes on a clipboard

Research Center & Demonstration Orchard

Researching new varieties of fruit producing trees, vines and other plant materials in sustainable ways for the Mojave Desert climate.

Youth Horticulture Education Program

Youth Horticulture Education Program is the premier program of horticulture projects that involve youth, families and educators.

News & Journal Articles, Fact Sheets, Reports...

Fact Sheets
*Hemp Basics: Anatomy of a Female Hemp Plant* This publication provides readers with a thorough introduction to the anatomy of the female hemp plant, which is grown and harvested for many uses. The major parts of female hemp plant are discussed and displayed in a diagram. McGue, L., Morawska, M., Robinson, M.L. and O'Callaghan, A.O. 2021, Extension, University of Nevada, Reno, FS-21-97
*Groundcover Plants for Southern Nevada: Viable Alternatives to Turfgrass* Groundcover plants are essential for keeping southern Nevada cool. While many desert residents are removing turfgrass to reduce water use, they should consider replacing it with the attractive, drought tolerant alternatives discussed in this publication. McGue, L., Robinson, M.L., O'Callaghan, A.O. and Leas, L. 2021, Extension, University of Nevada, Reno, FS-21-93
*Field Bindweed - An Attractive Nuisance, and Worse* A pretty plant may still be a weed, and field bindweed is a clear example. This attractive relation of morning glory can invade a landscape, interfering with the growth of desired plants both above and below ground. This fact sheet gives information on avoiding and treating field bindweed. O'Callaghan, A. and Robinson, M. L. 2020, Extension, University of Nevada, Reno, FS-20-33
*Root-Knot Nematode* Root knot nematode is a microscopic roundworm that attacks the roots of many garden plants, killing them. They are not easy to control, but this fact sheet gives guidance for the homeowner. O’Callaghan, A., Robinson, M.L., and Haas, S. 2020, Extension, University of Nevada, Reno, FS-20-24
*Growing Hops in Southern Nevada* Hops are mainly used for brewing beer. The perceived bitterness in an Indian Pale Ale is derived from the hops themselves. Hops can also impart other flavors into beers, such as fruity, citrusy, or spicy notes. However, hops can serve other purposes as well. Wynne, T., O’Callaghan, A., Robinson, M. L. and Anderson, J. 2017, Extension \| University of Nevada, Reno, FS-17-05
*Growing Sweet Potatoes in the Desert* Sweet potatoes easily grow in the desert and provide necessary vitamins and nutrients. By implementing the proper gardening techniques, everyone can enjoy the tasty treat. Sweet potatoes like a hot growing season, making southern Nevada an ideal place for them. Wynne, T., Robinson, M.L., Callaghan, A. 2017, Extension \| University of Nevada, Reno, Fact Sheet FS-17-02
*Green Fountain Grass* Too often, attractive plants that we bring into the landscape from other regions turn out to be just too successful. They usually have no natural enemies in the new area, so they are able to thrive. They appear in wild areas and begin to out-compete native plants. One of these is green fountain grass. O'Callaghan, A. M., and Robinson, ML 2014, Extension, University of Nevada Reno, FS-14-11
*Raised Beds Can Make Gardening Easier* How to use raised beds to make gardening easier! O'Callaghan, A. 2010, Extension, University of Nevada, Reno, FS-10-33
*Palm Problems That Aren't* Many people are not familiar with growing palm trees and make observations that they think are abnormal in the palms growth and appearance. This publication addresses these symptoms, perceived problem and explanation of what is actually occurring in the Palm. It is also an easy guide for the professional and homeowner. Robinson, M. L., and O'Callaghan, A. 2010, Extension University of Nevada Reno, FS-10-72
*Soil Solarization to Control Garden Pests* Control Garden Pests With Soil Solarization! O'Callaghan, A. 2008, Extension, University of Nevada, Reno, FS-08-29
*Lantana: An Attractive Shrub for Desert Landscapes* Lantana is widely used in Southern Nevada landscaping. This fact sheet is for those who wish to use this plant, what varieties are available, and how to grow it successfully. It also gives information on what adult butterflies are attracted to this plant. O'Callaghan, A. 2007, Extension, University of Nevada Reno, FS-07-40
*Growing Pomegranates in Southern Nevada* Pomegranates are a delicious fruit that grows well in the Mojave Desert. This publication gives needed guidance to people who wish to grow their own. Crites, A. M., Robison, G. D. and Mills, L. 2004, Extension University of Nevada, Reno FS-04-76
*Creating an Organic Garden in Southern Nevada* The idea of an organic garden can be an attractive idea, yet an intimidating one. This fact sheet guides people in the creation of an organic garden – soils, fertilizers, plant selection, cultural practices, as well as dealing with weed, insect and disease pests. O'Callaghan, A., and McKie, P. 2004, Extension, University of Nevada Reno, FS-04-72
*Hardening Off Plants* When plants are taken from a sheltered environment, like a home or a nursery, it is important that they be given the chance to become accustomed to the new one. This fact sheet gives gardeners the information they need to help plants successfully make the transition. Davis, R., and O'Callaghan, A. 2003, Extension, University of Nevada Reno, FS-03-71
*The Rose in the Desert Southwest* A comprehensive guide on growing roses in the desert southwest. It covers soil preparation and planting, monthly care, pruning, and disease problems for growing roses. It also includes a easy to follow month by month care guide for roses. Mills, L., Johnson, W. S., and O'Callaghan, A. 2003, Extension, University of Nevada, Reno FS-03-15
*Recognizing Plant Nutrient Deficiencies* There are 14 essential nutrients for plants, and when plants lacks one, it displays certain symptoms. This fact sheet explains how essential nutrients act in plants, and the symptoms of deficiencies. O'Callaghan, A. 2002, Extension, University of Nevada Reno, FS-02-65
*Home Vegetable Production in Southern Nevada* The Home Vegetable Production fact sheet was written to aid people who wish to grow their own food, but may be intimidated by Southern Nevada’s environment. It gives info on planting times, appropriate plants for this region, and ways to deal with problems gardeners may face. O'Callaghan, A. M. 2002, Extension, University of Nevada Reno, FS-02-61
*The Scientific Method* This fact sheet contains important information regarding the scientific method by taking a look that what it is and what it is not. Learn serval definitions like hypothesis and theory, the process of the scientific method, replication, and many more. Ryan, M. and O’Callaghan, A. 2002, Extension \| University of Nevada, Reno, FS-02-66
*Bats - Essential Members of the Southern Nevada Community* Bats can frighten people, although they are so important to most communities, both as pollinators and as insect eaters. This fact sheet explains bat behavior and gives people the information they need. O'Callaghan, A. M. 2001, Extension, University of Nevada Reno, FS-01-53
*Fire Blight* Fire blight is a serious disease of many woody plants, caused by bacteria. It is one of the few that can affect trees and shrubs in the Mojave. Because it is bacterial, there are few commercial products available to control it. This publication guides residents in recognizing and dealing with fire blight. Skelly, J., and O'Callaghan, A. 2001, Extension, University of Nevada Reno, FS-01-56
Recipes
*YHEP Summer Recipes, Ep.02: Garden Fresh Eggplant Empanadas* Delicious summer empanada dish using hearty eggplant created by Tricia Braxton Perry. Braxton Perry, T. 2020, Extension, University of Nevada, Reno, YouTube Channel
Special Publications
*Industrial Hemp White Paper Growing Hemp in the American Southwest* Publication provides horticultural, historical, and legal information on hemp; it is intended to educate the public and those interested in growing legal hemp in the American southwest. Proper growing practices, laws, fees, and hemp uses are discussed to provide readers with a solid introduction to the hemp industry. McGue, L., Lane, K., Robinson, M.L., McCoy, J., Morawska, M., Anderson, J., Lombard, K., Leas, L., Masson, R. and O'Callaghan, A.O. 2021, Extension, University of Nevada, Reno, FS-21-98
*Venomous Reptiles of Nevada (2020)* Venomous Reptiles of Nevada - This is an updated and expanded publication based on previous extension publications. It is intended to be used as reference material in the classroom, as well as in the field. Photographs and other materials have been upgraded to make identification more precise. Jones, J., Robinson, M. L., McKeever, B., and O'Callaghan, A. 2020, University of Nevada, Reno Extension, SP-20-13
*Research Orchard Fruit Evaluations & Recommendations for Southern Nevada - 2020* This publication is for both the homeowner and small commercial grower. The information contained has been gathered over years of research trials and observations of various types of fruit trees and vines growing at the University of Nevada, Reno Research Orchard. It is a handy guide for buying fruit trees and vines. Robinson, M.L., O'Callaghan, A., and Ruskamp, L. 2020, Extension, University of Nevada, Reno, SP-20-07
*Pruning Cacti And Other Desert Succulents* Pruning is an important part of any landscape maintenance program, including Southwestern desert landscapes. Pruning plants such as cacti, yuccas, agaves and other succulents is simple, but requires some basic plant knowledge. Robinson, M. L., O’Callaghan, A., and Anderson, J. 2016, Extension \| University of Nevada, Reno, SP-16-01
*Pruning Desert Shrubs in Southern Nevada-Type Climates* This publication is a guide to correct pruning of desert and desert adapted shrubs in the landscape. It details how to prune and why correct pruning is important to the health and beauty of the plants. Robinson, M.L., O'Callaghan, A., and Anderson, J. 2014, Extension, University of Nevada Reno, SP-14-13
*Creating a Community Garden* People who are concerned about food accessibility, variety and safety often consider growing their own vegetables and fruits. Community gardens can provide spaces for growing food and for contact with others living nearby. This publication provides guidance for creating and maintaining community gardens. O'Callaghan, A. M., Fagin, E., and Robinson, M. L. 2013, Extension University of Nevada Reno, SP-13-07
*Introduction to Pruning* Palm trees are one of the most dominant plant materials found in the landscapes of southern Nevada and throughout the desert Southwest.Unfortunately, most palm trees are incorrectly pruned by homeowners and commercial landscape maintenance companies.This publication explains why and how palm trees should be pruned. Robinson, M. L., O'Callaghan, A., and Anderson, J. 2013, Extension, University of Nevada Reno, SP-13-13
*Exotic Insects Invading Nevada’s Trees! Be a Citizen Monitor for Urban and Native Forests* Trees in cities create an “urban forest”. Protecting these trees maintains cooler temperatures, creates an aesthetically pleasing setting, and provides a home for birds. Boring insects can destroy trees, and this publication describes the damage and how to preserve trees for generations to come. Skelly, J., and O'Callaghan, A. 2012, Extension, University of Nevada Reno, SP-12-06
*How to Read a Soil Analysis Report* Gardeners who are growing plants in challenging landscapes, such as desert environments, need first to learn the characteristics of the soil where they will be growing. This publication leads the reader through reports, so they can understand what is in the soil, and how to use that information for successful gardening O'Callaghan, A. 2010, Extension, University of Nevada Reno, SP-10-12
*Mulches for Nevada Landscapes* All plants benefit from some kind of mulch. The type of plant determines what kind of mulch. This fact sheet explains what type to use and how to apply it. O'Callaghan, A. M. 2006, Extension, University of Nevada Reno, SP-06-10
*Becoming a Desert Gardener* Becoming a Desert Gardener is a comprehensive introduction to gardening in the desert southwest. It covers topics such as soils, fruit & vegetable selection and growing, as well as scheduling garden planting and proper fertilization. O'Callaghan, A., and Roberts, A. 2001, Extension University of Nevada Reno, SP-01-15
Videos
*YHEP: Common Weeds, Ep 04: The Many Uses of Mullein* Follow YHEP instructor Ian Ford-Terry up into the mountains as he hikes the cool woodlands in search of an ancient cough remedy! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Conservation, Ep 01: Joshua Trees* Join YHEP instructor Ian Ford-Terry as he explores the relationship between Joshua Trees and their exclusive pollinators and how you can take part in the conservation of a Mojave Desert icon! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Conservation, Ep 02: Joshua Trees* Join YHEP Instructor Ian Ford-Terry as he guides you through the process of growing a Joshua Tree from seed as part of a conservation effort to help save the Joshua Trees (and their very specific pollinators)! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Conservation, Ep 03: Monarch Container Gardens* Join YHEP Instructor Ian Ford-Terry as he shows you how you can help protect the Monarch Butterfly by planting native milkweeds at home! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Hydroponics At Home, Ep 01: DIY 2-Liter Bottle Wicking System* Join YHEP instructor Ian Ford-Terry as he introduces you to the wonderful world of hydroponics, and walks you through the steps to make a DIY 2-liter bottle, self-wicking hydroponic system! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Hydroponics At Home, Ep 02: DIY Aquaponic Ecosystem* Dive into this fun "aquaponics" project with YHEP Instructor Ian Ford-Terry! He will teach you the basics of balancing an underwater ecosystem and how you can grow plants using fish waste! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Hydroponics At Home, Ep 03: Growing Tomatoes in a 5-Gallon Bucket* YHEP Instructor Ian Ford-Terry shows you how you can grow tomatoes year-round in a DIY 5-gallon bucket hydroponic system! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Hydroponics at Home, Ep 03: Make Your Own pH Test Kit* Join YHEP Instructor Ian Ford-Terry as he walks you through the process of making your own homemade pH testing solution and pH testing strips out of Red Cabbage broth! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*YHEP: Hydroponics At Home, Ep 04: DIY Microgreens Grow Tray* Microgreens are nutritious and easy to grow! Join YHEP Instructor Ian Ford-Terry as he shows you how to make a low-maintenance microgreens grow tray! Ford-Terry, I. 2020, Extension, University of Nevada, Reno, YouTube Channel
*Grow Tomatoes in the Mojave Desert* This week YHEP Instructor, Nicole Hansen shows you how you can grow tomatoes successfully here in the Mojave Desert. Hansen, N. 2020, Extension, University of Nevada, Reno, YouTube Channel
*Okra* YHEP Instructor Nicole Hansen shows you how to feel like a professional gardener by growing Okra! Hansen, N. 2020, Extension, University of Nevada, Reno, YouTube Channel
*PPE for Summer Gardening and Crops for the Desert Summers - Peppers* The Mojave Desert is a unique growing environment. With summer temperatures that can go over 110 degrees Fahrenheit it is imperative that you use the "Right Plant, Right Place" theory. Community-Based Instructor, Nicole Hansen, teaches you how to grow peppers in the desert. Hansen, N. 2020, Extension, University of Nevada, Reno, YouTube Channel
*Stone Fruits* YHEP Instructor, Nicole Hansen teaches you all about stone fruits and shows you how to care for stone fruit trees. Hansen, N. 2020, Extension, University of Nevada, Reno, YouTube Channel
*Team YHEP Presents: Hydroponics Harvest and Donations* Team YHEP shows you how we harvest and package our hydroponic produce for donation to our food pantry partners throughout Las Vegas! O'Callaghan, A., Braxton-Perry, T., Hansen, N., and Ford-Terry, I., 2020, Extension, University of Nevada, Reno, YouTube Channel