Angela O'Callaghan

Photo of Angela O'Callaghan, Extension

Angela O'Callaghan

Social Horticulture Specialist

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

people siting in a botanic garden

Botanic Gardens

Extension's 3.3 acre outdoor educational Botanic Gardens are located at 8050 Paradise Road in Las Vegas. Maintained by faculty, staff and Master Gardener Volunteers, the gardens provide demonstrations and research opportunities. It features an orchard, vegetables, compost, mulch, native wash, children's garden, rose garden, cactus garden, milkweeds/monarchs, herbs and a team development course. The gardens are open to the public for self-guided and guided tours.

Master Gardener taking grape inspection notes on a clipboard

Center for Urban Water Conservation

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

las vegas nursing home garden

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.

gathering herbs

Master Gardeners of Clark County

Serving Clark, Lincoln and Southern Nye counties gardening needs.

Master Gardeners at tabling event

Master Gardeners of Nevada

Program trains local gardeners to provide research-based horticulture information to Nevadans

community gardening program

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
bindweed flowers
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
nematode
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
planting hops in nevada
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., and Jeff Anderson, O. 2017, Extension | University of Nevada, Reno, Fact Sheet FS-17-05
sweet potatoes
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
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
wooden raised bed
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 fond
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
sidewalk
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
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
pomegranate
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
las vegas garden tended by master gardeners
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
rose rooting in bottle
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
Tomatoes showing blossom end rot.
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
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
fruit tree with Fire Blight
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
Newsletters
Healthy LIVING While Aging! (2020/10)
Monthly newsletter covering: fall gardening; ergonomic gardening tools; healthy benefits of gardening; seasonal fall vegetables, exercise and physical activity, and a delicious fall butternut squash stew recipe.
Clarke, D., Lindsay, A., Mazzullo, N., Montana, C., O'Callaghan, A. 2020, Extension | University of Nevada, Reno, Newsletter, Volume 1, Issue 10
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
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
tree blossoming in orchard
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
collection fruits from cactus plants
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
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
Shredded wood or bark can be a useful organic mulch.
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
mullein in forest
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
ian with joshua tree
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
ian with joshua tree
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
Ian with milkweed
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
Assortment of DIY hydroponics projects
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
fish and plants in tank
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
Tomatoes in a 5-Gallon Bucket
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
pH test liquid being poured in a jar
YHEP: Hydroponics at Home, Ep 04: 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
Ian with microgreens tray
YHEP: Hydroponics At Home, Ep 05: 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
Tomato plants in garden
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 flowers and fruits
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
Nicole Hansen with Sunscreen
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
Peach tree
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
Harvesting lettuce
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

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