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Michael R. Evans and Brent K. Harbaugh

published as Florida Agricultural Experiment Station journal series R-03045. We thank Happiness Farms and Bates and Sons Caladiums for financial and material support of this project. Use of trade names does not imply endorsement of the

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Brent K. Harbaugh

Florida Agricultural Experiment Station Journal Series no. R-00063. Appreciation is extended to Bates & Sons Caladiums, Lake Placid, Fla., for supplying plant material and partial funding for this project. The cost of publishing this paper

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James E. Barrett, Carolyn A. Bartuska and Terril A. Nell

Paclobutrazol drench treatments were evaluated for efficacy on Caladium ×hortulanum (Birdsey) cultivars Aaron, White Christmas, and Carolyn Wharton. Drenches at 2.0 mg/pot did not reduce height of `Aaron' and `White Christmas' plants when applied 1 week after planting, but 2.0 mg applied at 3 weeks after planting did result in shorter plants. The difference for time of application may be due to the amount of roots present to take up paclobutrazol when applied. In two factorial experiments, there were no interactions between cultivar and time of application or amount of chemical. Paclobutrazol at 0.5 mg/pot resulted in plants that were shorter than the controls. Higher amounts of paclobutrazol provided additional reductions in height, but there was variation between the experiments for degree of effect with amounts >1 mg. Generally, commercially acceptable height control was provided by paclobutrazol drench treatments at 0.5 and 1.0 mg/pot applied 3 weeks after planting. Chemical names used: (2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-1,2,4-triazol-1-yl-pentan-3-ol (paclobutrazol).

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William J. Carpenter

Caladium hortulanum Birdsey cv. Candidum seed failed to germinate without light; maximum germination required daily, incandescent light of ≤4 hours. Lengthening daily lighting periods progressively reduced the days to 50% relative germination (T50) from 20 to 8, and days between 10% and 90% relative germination (T90 – T10) from 16 to 5. T50 and T90 – T10 were shortest (≈ 8 days) at 25 and 30C, while total or absolute germination percentage (G) was highest at ≈ 90%. G was 94% for seeds harvested immediately, but 75% or 38% for seeds that remained in fruits for 3 or 12 weeks after fruit abscission from the spadix. Total absolute germination was reduced from 95% to 87% when seed moisture contents declined to <14%. Seed storage for 7 days at from 10 to – 80 C-caused no reduction in G. Seeds were stored 6 months at 15C and 22%, 33%, or 52% RH without change in G, but storage at 5 or 25C and 11%, 75%, or 95% RH significantly reduced germination.

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Zhanao Deng and Brent K. Harbaugh

Caladiums ( Caladium ×hortulanum Birdsey, Araceae Juss.) are often used to provide color and a tropical ambiance to container gardening or the landscape ( Evans et al., 1992 ). Approximately 95% of the caladium tubers used in the United States and

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Zhanao Deng and Natalia A. Peres

Caladiums ( Caladium × hortulanum Birdsey, Araceae Juss.) can be grown in containers or planted in the landscape as accent and border plants ( Evans et al., 1992 ). They are valued for their long-lasting colorful foliage. Most of the commercially

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Zhanao Deng and Natalia A. Peres

Caladiums ( Caladium ×hortulanum Birdsey, Araceae Juss.) are often grown in containers or planted in the landscape as accent and border plants ( Deng, 2018 ; Evans et al., 1992 ). They are valued for their variable-shaped, bright foliage. The

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

Cultivated caladiums ( Caladium ×hortulanum Birdsey, Araceae Juss.) are valued for their colorful and variable-shaped leaves ( Harbaugh and Tjia, 1985 ; Wilfret, 1993 ). Cultivars generally are divided into three groups according to leaf shape and

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

Caladiums ( Caladium × hortulanum Birdsey, Araceae Juss.) are tropical ornamental aroids often used as potted plants or for providing color in the landscape. The propagules used in pots or landscapes are tubers, the underground storage organ of

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

Caladiums ( Caladium ×hortulanum Birdsey, Araceae Juss.) are ornamental aroids valued for their bright colorful leaves. They are commonly used as container and landscape plants. Pink cultivars have been very popular and the most popular pink