Low impact development (LID) design focused on minimizing runoff and improving effluent quality has led to an increase in LID features in built environments, such as rain gardens, bioswales, and constructed wetlands. These features require plants tolerant to various periods of flooding or saturated soils. Flooding can be chronic with freestanding water, chronic with long-term soil saturation but no freestanding water, or recurrent flooding with intermittent periods of drought. A system of screening using 12 replicated, floodable cells 1.2 m wide by 2.4 m long by 0.4 m deep equipped with liners and filled with 15 cm of sandy loam soil were engineered to mimic three types of flooding conditions and a well-drained control treatment. The well-drained control treatment was irrigated as needed to maintain ≥ –15 kPa soil moisture tension. Intermittent flooding consisted of inundating the cells weekly to the soil surface for 3 days and then allowing drainage. A bog or permanently saturated treatment was imposed by saturating the soil using float valves that maintained the subsurface water level even with the soil surface, but with no freestanding water. A chronically flooded treatment was maintained by use of float valves to achieve ∼7.6 cm of freestanding water above the soil surface. These cells were used to conduct two separate experiments with Taxodium distichum (L.) Rich., a species known to adapt to a wide range of flood conditions. Expt. 1 tested replicates of four different half-sib seedling populations and two cutting-propagated clonal selections for survivability, plant growth, and dry masses produced in the treatments. In general, seedling-propagated plants grew larger and survived at a greater percentage than cutting-propagated plants. In Expt. 2, replicates of three different genotypes were used as model taxa for testing genotypic responses. Even for this flood-adapted species, trunk diameter and root, shoot, and whole-plant biomasses were reduced in all three flood treatments relative to well-drained soil conditions. Survival was not statistically reduced by intermittent flooding, but was by chronic, boglike soil conditions and free surface-water flooding. Reduced oxygen concentrations were documented in flooded soils, particularly during the late summer. Soil temperatures in the control plots were ∼5 °C greater in late spring than those in all three flood treatments, whereas in late summer, the control and intermittent-flooded plots were similar and ∼2 °C warmer than the bog treatment, which was ∼2 °C warmer than the standing-water treatment. Soils were 9 to 13 °C warmer in late summer than in late spring.

Data were collected from four plant materials courses over the span of 20 years. Two classes were at the undergraduate level, Trees and Shrubs for Sustainable Built Environments (HORT 306) and Plants for Sustainable Landscapes (HORT 308), and two classes were at the graduate level, Plants for Landscape Design (HORT 608) and Plants for Landscape Design II (HORT 609). Data from these courses were analyzed to determine trends in student performance and benchmarks that might be associated with student success. Data included student enrollment, midterm course grades, final course grades, number of unexcused absences, student-reported study times for various activities, student major, student experience (class rank), whether the courses were required, and perceived difficulty levels of the courses. Trends in grade distributions were fairly stable until the last 3 to 4 years before COVID-19, when mean final grades and the frequencies of A or B grades increased. Midterm grades were strongly positively correlated with final course grades across majors in all four courses before COVID-19 (R2 = 0.90, 0.74, 0.72, and 0.54 for HORT 306, HORT 308, HORT 608, and HORT 609, respectively; P ≤ 0.001) and continued to be positively correlated after COVID-19. The number of unexcused absences was negatively significantly correlated with final course grades across majors (R2 = −0.69, −0.63, −0.21, and −0.45 for HORT 306, HORT 308, HORT 608, and HORT 609, respectively) before COVID-19 (P ≤ 0.001) and continued to be similarly correlated after COVID-19. Fewer reductions from midterm to final grades were observed for fall courses than for spring courses, particularly for seniors. Self-reported time spent studying all aspects of the courses was either not significantly correlated (P ≤ 0.05) or surprisingly slightly negatively correlated with the final course grades for all four courses. Perceptions of courses as moderately difficult (range, 7.0–8.0 out of 10.0) were remarkably stable overall but varied considerably by major (range, 5.0–8.3) and experience (range, 7.5 for seniors to 8.1 for freshman). More than 96% of enrollment in the graduate courses both before and after COVID-19 comprised Horticulture and Landscape Architecture majors, whereas undergraduate enrollment included a wide diversity of majors; however, the majority of those students were horticulture or landscape architecture majors. Biological science students or students who were architectural design majors were the top-performing students in both undergraduate courses, whereas undeclared majors, social science majors, and those in probationary major categories were among the lower-performing students in both undergraduate courses.

Variation in floral characteristics and growth habits within the native range of the North American wildflower Ratibida columnifera (Nutt.) Wooton & Standl. suggests potential for breeding and selection efforts to develop improved cultivars for commercial and residential landscapes. Experiments in seed propagation were performed to enable perpetuation of unique germplasms. Overnight hydration, storage condition variations, stratification and scarification, and seed maturation effects were assessed to determine impacts on viability and percent germination. Overnight hydration had no impact on percent germination. Germplasm had a significant effect on germination for all remaining experiments. Seed maintained viability at the same rate through 18 months, when slight reductions were noted. Cold storage at 3 °C had no effect on viability or percent germination of dry seed compared with storage at 23 °C. All three germplasms exhibited increased percent germination with some stratification period, and declined significantly in percent germination with all acid scarification treatments. Experiments indicated that most germplasms benefit from between 30 to 60 days of cold, moist stratification. There was a significant interaction effect among germplasms, location on the inflorescences, and maturity stages for R. columnifera. Data suggest that seed should be harvested as close as possible to when natural dispersal would occur for optimum germination. The degree of improvement in viability and percent germination associated with harvesting at various developmental stages, seed pretreatments, and storage conditions suggests that to achieve germination success, pretreatments should be used for propagation of seed from mature inflorescences and that variation can be expected within different genotypes of this species.

Variation in floral characteristics and growth habits within the native range of the North American wildflower Ratibida columnifera (Nutt.) Wooton & Standl. suggest potential for breeding and selection efforts to develop improved cultivars for commercial and residential landscapes. Toward that end, experiments in vegetative propagation were performed to enable perpetuation of unique germplasm. Stem development stage, applications of auxin, genotypic variation, and the effects of bottom heat applications were assessed to determine impacts on rooting percentages and adventitious root system quality measures. Younger apical stem sections rooted more readily and produced better quality root systems than more lignified basal stem cuttings. Optimal rooting percentages and rooted cutting quality ranged from 0.10% to 0.30% IBA (indole-3-butyric acid) quick dips, with 0.30% being optimal for most genotypes. Application of 26 °C bottom heat improved rooting ability in both cool and warm seasons compared with ambient and bottom heat of 32 °C. Bottom heat of 32 °C improved most rooting measures over ambient during the cool season, but not during the warm season. The degree of improvement in adventitious rooting associated with various developmental stage, auxin quick dips, and bottom heating varied among accessions of R. columnifera, suggesting that adventitious rooting characteristics should be evaluated as a selection criterion for cultivar development within this species.

Conjoint analysis can be used to simultaneously investigate consumer preferences on multiple attributes and levels. Our objective was to gain insight regarding consumer preferences for attributes and levels attributed to Ratibida columnifera, a wildflower of potential commercial interest. A ratings-based conjoint analysis using petal color (bicolor, marble, red, yellow), petal shape (circular, oval, notched, lobed), petal number (less than 10, more than 10), and price ($10.00, $15.00, $20.00) was conducted to elucidate part-worth utility from data from 1000 subjects recruited using Amazon Mechanical Turk (MTurk), a crowdsourcing marketplace. Subjects were then clustered according to their conjoint utility scores. In addition to the conjoint analysis, a principal component analysis was performed based on native plant knowledge of the respondent. Conjoint results revealed that petal color was the most important attribute in decision making, followed by price, petal shape, and petal number. Utility values revealed preference for bicolor petals, followed by red, yellow, and marbled color petals. Preference for price went from least expensive to most expensive. Circular petals were favored over oval, notched, and lobed. Subjects also preferred to have 10 petals or more, vs. less than 10 petals. Cluster analysis yielded three consumer segments, which differed in their utility values. These clusters differed in both demographics and R. columnifera preferences. Overall, consumers preferred R. columnifera with partial (bicolor) or complete red coloration over other options, lower prices, more petals, and entire circular or oval petals.

Cucumber ( Cucumis sativus L.) and habanero pepper ( Capsicum chinense Jacq.) growers have observed increased crop yield by placing bees in close proximity to these vegetable crops. However, adding managed bees typically may not be feasible for small-scale farmers or homeowners. Limited studies have demonstrated the potential of pollinator-attracting plants to be used as a lure to enhance the visitation of pollinators to adjacent food crops. This study evaluated the potential of adding pollinator-attracting plants in close proximity to cucumber and habanero plants to improve yields by either establishing permanent perennial companion plantings adjacent to the crops or interplanting annual companion plants within the row anew with each crop. The perennial treatment group consisted of Phyla nodiflora (L.) Greene, Borrichia frutescens (L.) DC., Salvia farinacea Benth. ‘Henry Duelberg’, and Eysenhardtia texana Scheele. The annual treatment group consisted of Cosmos bipinnatus Cav., Zinnia × marylandica D.M. Spooner, Stimart, & T. Boyle, Borago officinalis L., and Ocimum basilicum L. Multiple cropping cycles were initiated using both spring and fall seasons, and yield was assessed for three successive cropping cycles. Fruit quality was unaffected by pollinator-attracting companion plantings; however total and marketable yields were impacted. Cucumber yields were significantly ( P < 0.05) greater during fall harvests with annual companion plantings and with the second fall harvest in perennial companion plant plots. Perennial companion plots initially yielded less than control plots or annual companion plots due to the space allocated to the companion plantings and the fewer pollinators initially attracted to the plots compared with the annual companion plantings. When the perennial plots became more established, they resulted in similar yields as the annual companion planting plots. Although habanero yields were increased by annual companion plantings in spring and fall, cucumbers were unaffected by companion plantings in spring. This suggests a potential seasonality for the efficacy of some pollinator-attracting companion plantings for a given crop that could offer an opportunity to tailor companion plantings to attract specific pollinators at different times of the year.

Demonstrating and experimenting interdisciplinary teaching and experiential learning, faculty and students across three colleges (Agriculture and Life Sciences, Architecture and Engineering), and 4 departments (Landscape Architecture and Urban Planning, Horticultural Sciences, and Civil, Biological and Agricultural Engineering) designed, implemented, and are monitoring effects of a rain garden. This collaboration presents a model for multi-scalar, interdisciplinary studio instruction involving a project conducted by over 200 undergraduate and graduate students across allied fields. Landscape Architecture students provided designs, construction details, and performance monitoring of the site as well as developed a large-scaled campus master plan. Horticultural Sciences students propagated and produced the plants. Civil engineers assisted with constructed infrastructure design and water quality/quantity assessment. Professional landscape architects, urban planners, horticulturalists, engineers and campus facilities maintenance personnel evaluated student work. This paper specifies lessons learned from the application of a program that sought to educate and train students in LID alternatives to traditional stormwater management through hands-on outdoor classroom activities. While opportunities for interdisciplinary networking, knowledge of the landscape construction process, and the ability to utilize scientific rationale for design decision making all increased, challenges included coordination efforts across disciplines, overcoming unknown nomenclature specific to each field, delays due to unforeseen circumstances, and budgetary increased as a result of maintenance issues. However, Collaboration between multidisciplinary professionals enabled students to experience the professional design process and have a deeper understanding of the positive impacts of green infrastructure through interdisciplinary experiential learning.