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Hardiness Zones / 13

Hardiness Zones

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Zone 13

Hardiness zone 13: lowest average temperatures of 60°F and 70°F or +15.6°C and +21.1°C

Based on the minimum ten-year average winter temperatures, plant hardiness zones maps have been progressively developed, first by the Department of Agriculture (USDA) for the United States and then more or less applied to the rest of the planet. The purpose of these hardiness zones is to identify how well plants will withstand the cold winter temperatures of these zones. The USDA Hardiness Zone Map divides North America into 13 zones. The range of minimum average temperatures for zone 13 is between 60°F and 70°F or +15.6°C and +21.1°C. If you are planning to buy a shrub, perennial or tree, you need to make sure that this new plant will tolerate year-round conditions in your area. Therefore, to ensure your new acquisition will survive and grow year after year, you will need to compare the hardiness zone of your area with the hardiness zone of your plant.

Zone 13 Guides


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Cattleya bicolor (Corsage Orchid)

Cattleya bicolor (Corsage Orchid) is an epiphytic orchid boasting 2-5 inflorescences giving rise to highly fragrant, long-lived flowers. Blooming in the spring and early summer, occasionally in the fall, the scented blossoms, 4 in. across (10 cm), feature green sepals and petals flushed with bronze and a rich crimson-purple lip.

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Cattleya schilleriana (Consul Schiller's Cattleya)

Cattleya schilleriana (Consul Schiller's Cattleya) is a small-sized, epiphytic, or lithophytic orchid boasting 1-5 inflorescences giving rise to highly fragrant, long-lived flowers. Blooming in the spring and early summer, occasionally in summer and the fall, the blossoms, 4 in. across (10 cm), are wonderfully fragrant, waxy, and have a high sheen.

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Dypsis decaryi (Triangle Palm)

Exceptionally handsome, Dypsis decaryi (Triangle Palm) is a small to medium-sized palm adorned with a solitary trunk topped with a three-ranked crown of gray-green to blue-green, keeled, feather leaves. Resistant to drought, heat, and windy conditions, Triangle Palm can sustain foliage damage in light frost and can tolerate rare dips to 30ºF (-1ºC).

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Prosthechea cochleata (Cockleshell Orchid)

Prosthechea cochleata (Cockleshell Orchid) is a medium-sized epiphytic orchid species with long-lasting, ribbon-like flowers that resemble small octopuses. The flowers, up to 3 in. long (8 cm), feature pale-green petals and clam-shaped dark-purple lips, flushed yellowish-green and adorned with white bases deeply-veined purple.

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Rhynchostylis gigantea (Foxtail Orchid)

Rhynchostylis gigantea (Foxtail Orchid) is a fairly large, monopodial (rarely producing more than one stem), epiphytic orchid species boasting 3 to 4 pendulous, densely packed inflorescences with up to 50 highly fragrant flowers. Blooming in late winter to early spring, the waxy blossoms, 1 in. across (2.5 cm), are white, with red-violet, amethyst-purple, or magenta spots, and they feature a red-purple lip with darker veins.

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Senecio confusus (Mexican Flame Vine)

Pseudogynoxys chenopodioides (Mexican Flame Vine) is an attractive evergreen vine with fleshy, arrowhead-shaped leaves and large clusters of brilliant flowers over a long season. Blooming from late spring to fall (all year in mild winter areas), daisy-like, fiery orange-red flowers, adorned with golden centers, appear at the branch tips. Attractive to butterflies and bees, they gradually mature to red and give way to small dandelion-like puffs of seed. Perfect on trellis, cascading over walls or in hanging baskets.

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Sesuvium portulacastrum (Sea Purslane)

Sesuvium portulacastrum (Sea Purslane) is a fleshy prostrate evergreen perennial forming a mat of smooth, trailing, reddish-green stems that branch regularly. They are clothed with fleshy, elliptic-ovate, succulent leaves which turn red or yellow with age or when exposed to full sun. Small showy pink flowers are borne more or less continually throughout the year.

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Trachelium caeruleum (Throatwort)

Tough and undemanding, Trachelium caeruleum (Throatwort) is an upright perennial, often grown as an annual, forming a clump of stems clothed with sharply toothed, lance-shaped, dark green leaves. Blooming over a long summer season, small, slightly fragrant, violet-blue flowers held in large domed clusters, 6 in. across (15 cm), appear above the foliage.

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Triteleia ixioides 'Starlight' (Ithuriel's Spear)

Free-flowering, Triteleia ixioides 'Starlight' is a cormous perennial boasting loose umbels, 5 in. across (12 cm), packed with star-shaped, pale yellow flowers adorned with a pale purple stripe down the center of each petal.

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Vanda coerulea (Blue Vanda)

Vanda coerulea (Blue Vanda) is a medium to large-sized epiphytic orchid species boasting erect or suberect axillary inflorescences giving rise to large, long-lasting flowers. Blooming in the fall, the blossoms, 4 in. across (10 cm), are pale violet-blue to purple-blue, tessellated with darker purple.

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Vanda coerulescens (Sky Blue Vanda)

Vanda coerulescens (Sky Blue Vanda) is a small-sized epiphytic orchid species boasting erect or drooping axillary inflorescences giving rise to 15 or more pleasantly scented flowers. Blooming in late winter and spring, the long-lasting blossoms, 1 in. across (2.5 cm), feature white to pale violet-blue sepals and petals, and a purple-blue lip often adorned with white stripes.

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Vanda denisoniana (Lady Denison Londesborough's Vanda)

Vanda denisoniana (Lady Denison Londesborough's Vanda) is a medium-sized epiphytic orchid species boasting erect axillary inflorescences giving rise to strong vanilla-scented flowers in the evening. Blooming in late winter and spring, the blossoms, 2 in. across (5 cm), feature creamy-yellow sepals and petals and a yellow-green lip.

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Vanda sanderiana (Waling-Waling)

Vanda sanderiana (Waling-Waling) is a large sized epiphytic orchid species boasting stout, erect or ascending inflorescences giving rise to 4-10 large, long-lasting, fragrant flowers. Blooming mostly in the fall, the blossoms, 3.5-4.5 in. wide (9-11 cm), feature broadly elliptic, dorsal sepals and petals in a delicate rose color with brown spots towards their base. The lateral sepals are tawny-yellow, flushed and veined with red-blown.

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Vanda tricolor (Soft Vanda)

Vanda tricolor (Soft Vanda) is an epiphytic orchid species boasting erect to suberect inflorescences giving rise to 6-9 large, fragrant, long-lived flowers. Blooming in the fall and winter, the waxy blossoms, 2-3 in. across (5-7 cm), feature white sepals and petals outside, mottled with cinnamon-red or yellow inside, and a striking mauve or lilac lip.

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Watsonia pillansii (Beatrice Watsonia)

Watsonia pillansii (Beatrice Watsonia) is a robust, cormous perennial with sword-shaped leaves and bright orange flowers. Blooming in mid-summer, eye-catching spikes of 20-35 tubular orange-red flowers, each about 2 in. long (5 cm), rise atop erect stems. A popular garden plant and a good cut flower, it is spectacular in mass displays and useful for soil retention on banks and slopes.

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