Purdue Extension

Crops - Flower, Tree, Ornamental Crops

alternate text here Product Code: HO-203-W
Cold weather can injure fruit and vegetable crops, and ornamental plants, in fall, winter, and spring. This updated publication identifies types of injury, factors that influence the degree of injury, and steps that can  More...
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Flowering crabapples are susceptible to several diseases that result in yellow leaves and defoliation by early summer. Apple scab is one such disease.  More...
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Root problems in plants are frequently under- and misdiagnosed. Sometimes it's too late to save the plant. This publication, part of the Plant Pathology in the Landscape series, discusses predisposing factors, diagnosis,  More...
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Early-flowering varieties of petunia may have different fertilizer needs than late-flowering varieties. However, fertilizer recommendations are usually not variety-specific. This fact sheet provides information on the op  More...
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alternate text here Product Code: HO-314-W
In this publication, a Purdue University researcher discusses ways to slow plant growth - a major concern for greenhouse owners during the COVID-19 pandemic. Sales are down but ornamental plants continue to grow. It's im  More...
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This publication is a resource for those who are considering high tunnel production or are relative beginners. This resource describes: selecting the right size and type of high tunnel for your operation, choosing a s  More...

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This publication provides information about the product mix, advertising, marketing, and other business practices of U.S. landscape firms and compares them by their business diversification strategies (landscape only;  More...

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A soil test will reveal the current nutrient status in your soils and whether you need to add any nutrients as fertilizer. This publication describes the best practices for when and how to sample your soils.

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This publication examines how fungicides are classified and recommends management practices particular to pome fruit that can prevent fungi from developing resistance to these products.

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This publication examines how fungicides are classified and recommends management practices to prevent fungi from developing resistance to these products.

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This publication describes fungicide mobility, which is the how fungicides move after they are applied to plants.

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alternate text here Product Code: HO-283-W

This publication aims to provide information to growers about estimating the costs and benefits when they use supplemental lighting.

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This publication summarizes how much additional fertilizer a crop needs under sub-irrigation when the growing medium contains  More...

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This publication will help you accurately perform the pour-through technique for measuring substrate electrical conductivity (EC).

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This publication explains the details of substrate electrical conductivity (EC) for greenhouse growers.

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This publication details substrate characteristic s and provides research-based information about them as a reference to guide growers.

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This publication describes the symptoms of oak wilt disease, its cause, and management options that are available.

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This publication describes the importance of measuring plant light use, and then describes a study that offers some promise of  More...

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White pine trees are a common component of Midwest landscapes. Sometimes, these trees die unexpectedly and rapidly, seemingly without a specific cause. This unpredictable problem is called white pine decline. The publ  More...

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alternate text here Product Code: PPP-115

This is a joint publication of Purdue Extension and Southern Illinois University. This is the 13th edition of the biennial publication, which was previously published by Southern Illinois. This edition contains 780 en  More...

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While agricultural pesticide applicators may not be able to control factors like habitat loss, they can take practical steps to help protect the pollinators so many in the agricultural industry rely upon. This publica  More...

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One of the most important cultural considerations and investments you can make when you want to produce a successful greenhouse or nursery crop is to select the best substrate components or pre-formulated substrates (als  More...
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This publication lists potential alternatives to some of the most notorious and damaging invasive plants commonly used in Indiana landscapes. Unlike other resources, this list includes both native and non-native species.  More...
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In late summer, the outside branches of many of the more commonly planted deciduous trees can become covered with webs produced by fall webworm caterpillars. When unchecked by the wide variety of insects and birds that  More...
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In greenhouse and nursery production, photoperiod can influence many aspects of plant growth and development including dormancy, storage organ formation, and (most importantly for many greenhouse producers) flowering. Th  More...
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alternate text here Product Code: HO-240-W
Plants obtain nearly all their nutrients from the soil, but not all the nutrients present in the soil are accessible to plants. That's because soil pH affects the form and, therefore, solubility of nutrients. This public  More...
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Soil pH is important because it affects the availability of nutrients a plant needs to grow and thrive. This publication explains when lowering soil pH is important for commercial producers and recommends practices to sa  More...
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Because the substrates used in commercial greenhouses do not contain soil, they lack many of the nutrients in sufficient quantity to maximize plant growth and development. This publication examines the basics of greenhou  More...
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This publication helps hardwood producers understand the tax and financial advantages (and disadvantages) related to their planting operations.  More...
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Pesticide drift can severely damage non-target crops. This Driftwatch publication addresses drift in grapes. It examines products of special concern, injury symptoms and potential impact, and alternatives and ways to avo  More...
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alternate text here Product Code: HO-250-W
Greenhouse growers are often concerned about the costs of managing pests and pathogens. Proper greenhouse sanitation is a key component in reducing those costs and improving plant quality. This publication discusses gene  More...
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A publication for landowners with wooded areas. Covers weed control strategies and related issues.  More...
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Successful poinsettia propagation begins with high-quality cuttings and an ideal rooting environment. This publication describes optimal greenhouse conditions and management practices for improving propagation success an  More...
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alternate text here Product Code: HO-249-W
If annual bedding plants have even just a few flowers, customers get an idea of what the plant looks like in full bloom, which can increase impulse purchases. However, to be able to deliver to retailers annual bedding pl  More...
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alternate text here Product Code: HO-247-S-W
Dado que el agua es un elemento esencial, invernaderos comerciales y operaciones de viveros necesitan mantener el abastecimiento de agua en cantidad y calidad suficiente para producir plantas de manera rentable. Esta pub  More...
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alternate text here Product Code: HO-248-B-W
This brochure is a general reference to help greenhouse producers make basic decisions about applying plant growth retardants (PGRs) in greenhouse settings. The full version of this publication, Commercial Greenhouse and  More...
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alternate text here Product Code: BP-181-W
Several species of Pythium attack plant roots, and cause cutting rots, stem rots, and foliar blight under the right conditions. These pathogens are a significant problem in the greenhouse and nursery industries.  More...
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The author uses this blog in conjunction with a class as a forum for exploring all subjects touching upon insects and arthropods. Comments are encouraged, but moderated, to encourage a thoughtful community. The author, J  More...
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Controlling plant size is one of the most important aspects of greenhouse crop production. An alternative, effective strategy for controlling plant height is to use chemical plant growth retardants (PGRs). The goals of t  More...
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Because water is so essential, commercial greenhouse and nursery operations need to maintain water supplies of sufficient quantity and quality to produce plant material profitably. This publication is not a comprehensive  More...
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This brochure provides basic information about measuring Daily Light Integrals (DLI) in greenhouses, including DLI requirements for certain crops.

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alternate text here Product Code: HO-242-SW
Productores de invernaderos y viveros muchas veces asumen que la presencia de hojas amarillas o pálidas son signos de deficiencias nutricionales. A veces, sin embargo, el problema se debe a la ausencia de nutrientes  More...
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alternate text here Product Code: HO-246-W
The U.S. Department of Agriculture National Agriculture Statistics Service (USDA-NASS) released the 2007 Census of Agriculture on February 4, 2009. State and federal policy makers, researchers, extension personnel, growe  More...
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alternate text here Product Code: HO-238-W
In commercial greenhouses, several strategies can be used to help properly manage light levels throughout the day and seasonally. This publication examines the characteristics of greenhouse lighting and describes one man  More...
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alternate text here Product Code: HO-237-SW
El monitoreo del pH y la conductividad eléctrica (CE) de medios de crecimiento nos da la habilidad de corregir este tipo de inconvenientes antes de que se conviertan en problemas que pudieran perjudicar a los cultiv  More...
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alternate text here Product Code: HO-238-SW
En la producción comercial bajo invernadero varias estrategias pueden emplearse para manejar de manera adecuada los niveles de luz a lo largo del día y según las temporadas del año. Esta publicaci  More...
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Growers often do not have a clear understanding of the underlying causes behind increased substrate pH—water alkalinity, rather than water pH, is typically the source of the problem. This publication helps growers  More...
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alternate text here Product Code: ID-416-W
One of the best ways to prevent serious plant disease outbreaks in the greenhouse, nursery, or landscape is to grow plants with demonstrated disease resistance. This publication describes disease resistance in plants, pr  More...
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alternate text here Product Code: HO-237-W
Monitoring the pH and electrical conductivity (EC) of growing substrates is a way to correct issues before they become problems that damage crops. This publication recommends best practices for establishing a pH and EC t  More...
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La propagacion exitosa de poinsettias (flores de pascua o nochebuena) empieza con una alta calidad de los esquejes y un ambiente ideal para el desarrollo radicular. Esta publicacion describe cuales son las condiciones op  More...
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alternate text here Product Code: HO-214-W
This publication is a listing of Federal and Indiana state government agencies that regulate various activities involved in operating a landscape plant nursery.  More...
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alternate text here Product Code: HO-215-W
This publication is a reference list of informative publications which can provide answers and guidance to the commercial nursery grower on topics from propagation to pest management.  More...
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alternate text here Product Code: HO-212-W
This publication discusses starting in the nursery business, including what you'll need, developing a nursery business plan, selecting a specific nursery site, nursery design and space requirements, and labor and capit  More...
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alternate text here Product Code: HO-213-W
This is a reference list of informative publications which can provide answers to many of the questions which arise when considering a new nursery business.  More...
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alternate text here Product Code: HO-207-W
This publication provides a reference list of informative publications for experienced and new commercial producers of floricultural crops, with accompanying descriptions.  More...
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