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Welcome to 'PEP', our “Protea
Education Program”. Our
ultimate goal is to educate and inform about the benefits
of Protea...flowers beyond the ordinary. Your questions,
comments and suggestions are always appreciated. |
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| IMPORTANT MESSAGE | ||
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| Topic of the month…Protea vs. the Giant Sequoia | ||
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Giant Sequoia is the world's largest tree in terms of total volume. They grow to an average height of 50-85 m (150-280 ft) and 5-7 m (16-23 ft) in diameter. Record trees have been reported to be 93.6 m (307 ft) in height and 8.85 m (29 ft) in diameter. The oldest known Giant Sequoia based on ring count is 3,200 years old. The Giant Sequoias are having difficulty reproducing in their original habitat (and very rarely reproduce in cultivation) due to the seeds only being able to grow successfully in mineral soils in full sunlight, free from competing vegetation. Although the seeds can germinate in moist needle humus in the spring, these seedlings will die as the duff dries in the summer. They therefore require periodic wildfire to clear competing vegetation and soil humus before successful regeneration can occur. Without fire, shade-loving species will crowd out young sequoia seedlings, and sequoia seeds will not germinate. When full grown, these trees typically require large amounts of water and are therefore often concentrated near streams. Below are two Giant Sequoias, Sequoia National Park. Note the large fire scar at the base of the right-hand tree; fires do not kill the trees but do remove competing thin-barked species, and aid Giant Sequoia regeneration.
Fires also bring hot air high into the canopy via convection, which in turn dries and opens the cones. The subsequent release of large quantities of seeds coincides with the optimal post-fire seedbed conditions. Loose ground ash may also act as a cover to protect the fallen seeds from ultraviolet radiation damage. So, you ask, what does this have to do with growing Protea. Well, fire and germination off course. The Proteaceae family is found in a vast variety of vegetations, from savannas and grassland to heavily overgrown hillsides. They thrive in areas that are prone to periodic veldt fires. Many of the Proteaceae have evolved specialized survival techniques in response to these fires. Their strong root systems and thick bark on some varieties, have given these extraordinary plants the ability survive the heat and smoke generated by fires. In fact, fire and smoke provide the major trigger in the wild for the Protea seeds to start the germination process. Seed can lie dormant for years waiting for the right conditions, usually brought on by wild fires. For these fire-sensitive species, habitat burning is the single most important cue for triggering germination of the dormant seed. In growing fire-prone floras commercially, particularly those of Mediterranean zones, a solution had to be found to germinate the Proteaceae seed, without burning your growing fields every year. Following the discovery that smoke stimulated germination of this rare South African Proteaceae, the exploration of the benefits of smoke-mediated germination has expanded to different parts of the world and has been applied in nurseries and in rare flora conservation. It became clear that seed dormancy of Protea seed is broken when 1) the seeds absorb water; 2) the seed are subject to relatively low temperatures; and 3) the seeds have been exposed to smoke. Various methods have been tried; aerosol smoke, smoke dissolved in water and solids (activated clays or sand particles) that have been smoked have all been effective in promoting Proteaceae seed germination. Various chemicals have also been found to break dormancy in the seed, and even soaking the seed in green tea have been reported to trigger germination in some varieties.
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Best regards, |
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Please feel free to e-mail me with any questions, comments or suggestions at eugene@DiscoverProtea.com |
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A wise man once said…"always
surround yourself with people that are smarter that you are". |
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| Ask the Experts... | ||
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Below is a list of experts that I consult on a
regular basis in order to get you most accurate and up-to-date information about growing Protea. |
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| Lawrence Kellar | ||
| Managing Director at
Rainbow Protea in Fallbrook, California, Lawrence brings to the table Protea knowledge from both hemispheres. Lawrence is a second generation Protea grower from South Africa and an active member of the California Protea Association. Interested in growing Protea commercially? Lawrence can help. Contacted him at lawrence@rainbowprotea.com |
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| The Australian Native Plants Nursery | ||
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http://www.australianplants.com/index.html is a retail nursery specializing in ornamental trees and shrubs for Californian gardens. Their nursery grows many plants from the Australian protea family, such as banksia, grevillea, hakea and isopogon as well as small eucalypts, acacias and leptospermums. They also grow South African leucadendrons, leucospermums and proteas. Jo travels to Australia each year in search of new species to introduce into Californian gardens. They have seed and plants available for mail order. The nursery is operated by owner Jo O'Connell, an Australian horticulturist from Sydney. Contact Jo at 1-800-701-6517 or email: jo@australianplants.com |
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| Barrels and Branches Nursery – Encinitas, California | ||
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Tucked away in the
scenic coastal community of Encinitas (San Diego, CA) is a unique nursery called Barrels and Branches. Meandering down the pathways you will enjoy the tranquil sounds of water and wildlife, while discovering many unusual plants that thrive in this area. This retail garden center has a wide variety of perennials, succulents, California natives, fountains and fine pottery. In addition to being a full service nursery, maintenance and design services are also available. You will feel like you have discovered your own personal retreat, welcomed by friendly knowledgeable landscape professionals to assist you. At the recent "Spring Home and Garden Show" in San Diego, CA, they were awarded, 2nd Place Best in Show, Compatibility of Plant Material, Perfection in Nomenclature as well as three outstanding specimen awards. Visit them at http://www.barrelsandbranches.com/ or contact Samantha or Danica at (760)753-2852. |
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