| Environmental stress can increase the occurence of diseases and pests on plants. | | | | | |
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| Improper management practices can increase the occurence of diseases and pests on plants. | | | | | |
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| Knowing the history of how a landscape is managed is often crucial for diagnosing plant stress correctly. | | | | | |
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| Knowing installation details for landscape plants is often crucial for diagnosing plant stress correctly. | | | | | |
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| Drought symptoms can be caused by many stresses other than lack of water. | | | | | |
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| Working organic matter into soil before planting trees and shrubs is not a long term solution to changing soil conditions. | | | | | |
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| Routinely adding organic matter to the top of soil as a mulch is a long term solution to changing soil conditions. | | | | | |
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| Root washing nursery trees and shrubs before planting improves root establishment. | | | | | |
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| Improper tree staking can cause trees to fail once staking is removed. | | | | | |
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| Tree stakes should never be left on for more than one year. | | | | | |
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| Urban landscapes are rarely deficient in phosphorus. | | | | | |
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| Too much phosphorus can cause plant deficiencies in iron and manganese. | | | | | |
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| Too much phosphorus can inhibit beneficial mycorrhizae from colonizing plant roots. | | | | | |
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| Landscape fabric will ultimely harm tree roots and fail to control weeds. | | | | | |
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| Transplant amendments, such as antitranspirants and transplant vitamins, are unnecessary expenditures and some can harm trees. | | | | | |
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