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Abiotic Damage


Phytotoxicity is damage to plants caused by chemicals, fertilizers, or pesticides.  Phytotoxicity can be a positive (killing weeds) or a negative (damage from pesticides on ornamental plants), depending on the intended results.  Some of the common phytotoxic effects can show symptoms such as stunting of leaves and whole plant, necrosis (death), chlorosis (yellowing), abnormal growth…Read more about Diagnosing Phytotoxicity on Landscape Plants[Read More]


Diagnosing herbicide injury on ornamental plants can be difficult due to the sheer number of cultivated plants and the number of active ingredients used around ornamentals.  Modern cultivars of ornamental plants include characteristics much different from the species, so it’s important to know ‘normal’ to properly diagnose a problem. There are several reasons that herbicide…Read more about Diagnosing Herbicide Injury on Ornamentals[Read More]


The hard freeze last week had many homeowners concerned about their perennial and annual plants in their landscape.  For the vast majority of perennial plants, there aren’t many issues long-term of concern.  Some foliage and flowers have significant damage, but the plants will recover, and possibly release new vegetative buds in severe cases.  The plants…Read more about Effects of Recent Cold Temperatures on Plants[Read More]


PART 1 – The Importance of “Physical” Soil Testing In my 40 years of teaching and consulting, one of the biggest and most frustrating problems I continually encounter is when so called “landscape professionals” and homeowners continue to apply annual soil fertilizers, lime, and other soil amendments without ever conducting a professional soils test. Before…Read more about WHY is Professional Soil Testing So Essential ??? – PART 1[Read More]


This week’s forecast is indicating unseasonably cold temperatures for most of the state with lows in the lower 20’s.  While the temperatures shouldn’t reach record setting status, it could cause some plant stress.  Plants are most susceptible to cold injury going into dormancy and coming out of dormancy, with maximum cold hardiness during the winter. …Read more about Effect of Cold Temperatures During Bud Break[Read More]


It’s that time of year that roadways and sidewalks begin to be treated with salt.  To prevent accidents, both vehicular and slips, salt is an invaluable tool that keeps people safe.  For all of the benefits for humans, plants aren’t as appreciative.  We have two great resources available that explains salt damage in great detail…Read more about Alleviating Landscape Soils with High Salt Concentrations[Read More]


I hear this complaint or issue more frequently, “what can I do about the neighbor’s tree?” or “my neighbor just butchered my tree!”.  Often, we see issues with a neighboring tree that may threaten safety or appears to be an elevated risk.  For example, from the view of your window you see your neighbor’s tree…Read more about The Tree Next Door[Read More]



Please join us Wednesday (September 16th) for our bi-weekly, live educational series.  The event will take place at 12:00 pm (Eastern) on Zoom at https://purdue-edu.zoom.us/j/96190839031 or on Facebook Live at https://www.facebook.com/PurdueLandscapeReport/. The following speakers and topics will include: Costs of Applying Plant Growth Regulators (PGRs) for Shrub Maintenance-Ariana Torres Plant Selections You’ll Live to Regret-Tom Creswell Manganese Deficiency…Read more about Purdue Landscape Report: Virtual Live[Read More]


The Purdue Landscape Report Team will begin a new, free online series that will start tomorrow (July 22) and follow the day after the newsletter every two weeks at noon Eastern time zone.  The topics and speakers will vary each session, so check out the newsletter every two weeks to find out what follows the…Read more about Purdue Landscape Report Team Begins New Virtual Series[Read More]


Hot, dry summers are not that unusual in the Midwest, but 2020’s hot dry spell started considerably earlier than usual, before summer even officially began! To make it a triple whammy, the hard freeze in early May caused some landscape plants to burn up more stored carbohydrate reserves to produce a second round of foliage….Read more about Dog Days of Summer Barking Early This Year[Read More]


A mild winter, followed by a brief warm-up, caused many plants to flower or leaf out before one last freeze. Unfortunately, that succulent new growth is much more susceptible to frost and freeze damage. Freeze injury in many plants will occur when the temperature falls below 32° F (0° C) and the water within the…Read more about 2020 has jumped the shark![Read More]


As so many gardeners are staying at home these days, we’ve had more opportunity to enjoy the spring display. And then, perhaps inevitably, “normal” spring frost and freeze visited – some plants are vulnerable to damage. The amount of damage will depend on how far along they are in their development. Home fruit-growers may have…Read more about Assessing Freeze Injury on Horticultural Plants[Read More]


Usage of mulch at the base of trees is a very common and recommended practice to protect the trunk from mower damage, as well as improve root conditions by preventing weed and grass growth in the root zone. Mulch also increases moisture retention in the soil, and improves soil quality as it breaks down over…Read more about Mounds upon Mounds of Mulch[Read More]


The 2019 season provided challenges that were unexpected to the Green Industry, which included an abundance of rainfall followed by drought-like conditions, new invasive pests, concerns about glyphosate use, and many others.  The Purdue Landscape Report focuses on timely articles that help Green Industry professionals make decisions for their business and keep abreast of looming…Read more about A Look Back at a Challenging 2019 Season[Read More]


The urban environment is tough for growing trees and our changing climate is going to make it even tougher. Planting trees is part of the solution, but not the answer. We can’t just keep planting trees; we have to start growing and sustaining existing trees.


It’s not unusual for Indiana weather to have trouble deciding what season it is. Warm spells during the dormant period often lead to bulbs poking their foliage (and sometimes flower buds) through the soil.  While we’re more used to seeing this happen during February warm spells, our frigid temperatures arrived a bit early in the…Read more about Mother Nature Gives Spring Bulbs the Heave-Ho![Read More]



Deicing salts can save your neck this winter, but they can spell disaster for landscape plants. Whether the salt is sprayed on the plants from passing traffic near the road or is shoveled onto plants near the sidewalk, the salt can cause damage. Salts can adversely affect plants in several ways. Salts deposited on the…Read more about Deicing salts helpful for people but not landscape plants[Read More]


Many tree issues are relatively easy to diagnose, but, when it comes to diagnosing issues below ground, where the roots are located, it becomes a bit tricky.


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