University of California

Ornamentals English

Bird of Paradise

Recommendations for Maintaining Postharvest Quality

birdofparadise001-2
Michael S. Reid

Department of Plant Sciences, University of California, Davis

Recommendations for Maintaining Postharvest Quality

Description

Strelitzia reginae. The bird of paradise inflorescence consists of a boat-shaped bract containing a series of 4 or 5 flowers, so when an exposed flower withers, another one can be pulled out. Few cut flowers have this capability. Traditionally, Southern California growers bag the inflorescence a few weeks before harvest. Slender, elongated waxed paper bags are placed over the expanding bracts a week or more before the orange flowers are ready to emerge. The bags protect the brittle flowers by holding them inside or next to the bracts. The bag also helps prevent Botrytis mold, rain and hail damage, aphid attacks, and sunburn of the flowers. The specific epithet reginae means “queen”.

Quality Indices

Inflorescences bend as they reach maturity, assuming a 90° angle to the stem. The first emerging orange flowers can barely be seen through the paper bags. The stems are pulled at this point. Stems can also be harvested in the tight bud stage before the first flowers emerge. At this stage the inflorescence is swollen, and there is a slight orange crack on the upper surface. The inflorescence is mature at the tight bud stage, and is at the optimum stage for harvest in regards to ease of handling and flower longevity. Flower stems are generally pulled off rather than cut. A side to side pulling motion is often necessary to loosen the stem at the base of the plant, although the inflorescences can break off if jerked too vigorously. Make sure flower heads are dry at time of purchase. If flowers are wet or have excessive nectar exudation upon unpacking then the possibility of subsequent postharvest disease problems is increased.

Maturity & Quality Photos

birdofparadise-quality

Title: Quality

Photo Credit: Michael Reid, UC Davis



Grading and Bunching

Strelitzia stems are sorted into at least 3 grades according to stem length and inflorescence size. For premium grade flowers, the field bags are replaced with new bags. Five stems are firmly tied together at 2 points with the inflorescences facing in the same direction. The stem ends are evenly trimmed. A paper wrapper is placed around the bunched inflorescences to further protect the flowers.

Ethylene Sensitivity

Strelitzia flowers are insensitive to ethylene and their life is not improved by treatment with STS or 1-MCP.

Pretreatments

Flower longevity can be substantially increased by pulsing buds or flowers for 24 hours (48 hours is even better) with a solution containing 10% sucrose, 250 ppm 8-hydroxyquinoline citrate (8-HQC), and 150 ppm citric acid.

Storage Conditions

The optimum long term storage temperature range for this species is 6-7°C, which is different from most other flowers. Storage below this recommended range could result in chill disorders, the appearance of brown lesions on the flowers and bracts, and the failure of the flower to open properly. For short-term storage, hold the flowers at room temperature, or in a tropical storage room (12.5°C). Strelitzia flowers harvested in the tight bud stage will open and have satisfactory vase life after 4 weeks in storage if pre-treated with a fungicide, wrapped to prevent desiccation, and stored at 7°C and 85-90% R.H.

Packing

The waxed paper bags on each inflorescence and the paper wrapper on each bunch give ample protection from handling injury and desiccation. Because they are very heavy, Strelitzia stems should be packed in shallow cartons

Special Considerations

If flowers fail to emerge from the spathe (the modified leaf below the flowers), the first flower can be gently eased out by hand and will normally provide good display life.

Date

July 2003

Use of Materials

The UC Postharvest Technology Center grants users permission to download textual pages (including PDF files) from this World Wide Web site for personal use or to reproduce them for educational purposes, but credit lines and copyright notices within the pages must not be removed or modified.

Except for these specified uses, no part of the textual materials available on the UC Postharvest Technology Center Web site may be copied, downloaded, stored in a retrieval system, further transmitted or otherwise reproduced, stored, disseminated, transferred or used, in any form or by any means, except as permitted herein or with the University of California's prior written agreement. Request permission from UC Postharvest Technology Center. Distribution for commercial purposes is prohibited.

Links to any of these UC Postharvest Technology Center pages are permitted, but no endorsement of the linking site or products mentioned in the linking page is intended or implied by such a link.

How to Cite

Author(s) names. Initial publication or update date (located at the top). Title. Link to the specific Produce Fact Sheet webpage (Accessed date)

Example: Cantwell, M. and T. Suslow. 2002. Lettuce, Crisphead: Recommendations for Maintaining Postharvest Quality. 

http://ucanr.edu/sites/Postharvest_Technology_Center_/Commodity_Resources/Fact_Sheets/Datastores/Vegetables_English/?uid=19&ds=799 (Accessed January 18, 2014).

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